Ermine frosting is the silky, not-too-sweet buttercream old cookbooks kept secret — here is everything you need to make it beautifully at home.
Ermine frosting might be the most underrated frosting technique in the home baker’s repertoire, and once you understand how it works, it becomes genuinely hard to go back to the standard powdered-sugar versions. Also called flour buttercream or boiled milk frosting, it starts with a cooked paste of flour and milk that gets whipped together with butter until it reaches a texture that is almost impossibly light and creamy. It is not overly sweet, it holds its shape well, and it pipes beautifully onto everything from layer cakes to cupcakes.
What makes this frosting worth your time is the technique itself. Instead of leaning on mountains of powdered sugar to create structure, ermine frosting builds its body from a cooked starch base — a simple roux of flour and milk that thickens on the stovetop and then cools before hitting the mixer. The result is a frosting that tastes like sweet, whipped cream rather than straight sugar. It is especially well-suited to red velvet cake, vanilla layer cakes, and any bake where you want the frosting to complement rather than overpower the crumb beneath it.
Why Ermine Frosting Deserves a Place in Your Baking Rotation
Recipe Card
Ermine Frosting
Silky, cloud-light, and barely sweet — this old-fashioned cooked-flour buttercream whips up into the most luscious, ribbon-smooth frosting you’ll ever spread onto a cake.
Prep
15 mins
Cook
10 mins
Total
25 mins
Serves
12 servings (frosts one 2-layer 8-inch cake or 24 cupcakes)
Ingredients
Instructions
- 1. Whisk the flour and whole milk together in a small saucepan over medium heat, stirring constantly, until the mixture thickens into a smooth, pudding-like paste that holds a line when you drag a spatula through it, about 8–10 minutes.
- 2. Remove the pan from the heat, stir in the vanilla extract and salt, then press a sheet of plastic wrap directly onto the surface of the paste to prevent a skin from forming — allow it to cool completely to room temperature (about 30–40 minutes; do not rush this step).
- 3. Beat the softened butter and granulated sugar together in the bowl of a stand mixer fitted with the whisk attachment on high speed for 5–7 minutes until the mixture is very pale, fluffy, and the sugar is fully dissolved.
- 4. Add the cooled flour paste one heaped tablespoon at a time to the whipped butter mixture with the mixer running on medium speed, waiting for each addition to fully incorporate before adding the next.
- 5. Once all the paste is added, increase speed to high and whip the ermine frosting for 3–4 minutes until it is silky-smooth, bright white, and holds beautiful soft peaks.
- 6. Use immediately to frost a cooled cake or cupcakes, or store in an airtight container at room temperature for up to 8 hours — re-whip briefly before using if it has been refrigerated.
Tips & Notes
- – Temperature is everything: both the flour paste and the butter must be at true room temperature before combining — cold paste or cold butter will cause the frosting to look curdled and lumpy.
- – If your frosting looks broken or soupy, simply keep whipping on high speed — it will come together into a smooth emulsion within a few minutes.
- – For a hint of extra flavor, add 1/2 teaspoon almond extract alongside the vanilla.
- – Ermine frosting is the traditional pairing for red velvet cake and pairs beautifully with vanilla, lemon, or funfetti cake layers.
KitchenGuide101.com
If you have ever felt like standard American buttercream is just a little too sweet — cloying in a way that makes you scrape some off the slice — ermine frosting is the answer you have been looking for. It delivers genuine buttery flavor without the sharp sweetness that can overwhelm a delicate cake. The flour paste acts as an emulsifier, allowing a larger ratio of butter to come into the mix while still keeping things stable. The texture sits somewhere between a mousse and a whipped cream, airy but substantial enough to hold a rosette or a clean swipe with an offset spatula. It also plays very well with natural colorings if you want pastel tones for a celebration cake, because the base is so pale and neutral.
What You Will Need to Make This Frosting
The ingredient list for ermine frosting is refreshingly short, which means the quality of each component matters. Whole milk gives you the richest paste — lower-fat milks work but produce a slightly less creamy result. All-purpose flour is the thickener, and you only need a few tablespoons, so there is no need for anything specialty. Granulated sugar goes directly into the milk mixture as it cooks, which helps it dissolve completely and eliminates any graininess. Unsalted butter should be genuinely room temperature — soft enough that your finger leaves an easy indent — because cold butter will not whip smoothly into the paste and you will end up with a lumpy, broken frosting. A pinch of fine salt sharpens all the flavors. For flavoring, alcohol-free vanilla extract or vanilla bean paste works beautifully and keeps the flavor clean and floral without any harsh aftertaste.
- Whole milk — about one cup for a standard batch
- All-purpose flour — three to four tablespoons
- Granulated sugar — three quarters to one cup, depending on your preference
- Unsalted butter — two sticks, fully softened to room temperature
- Fine salt — just a small pinch
- Alcohol-free vanilla extract or vanilla bean paste — one to two teaspoons
How to Make Ermine Frosting Step by Step
Start by whisking the flour and a splash of the cold milk together in your saucepan until you have a smooth slurry — this prevents lumps from forming when the heat hits. Add the remaining milk and the sugar, then set the pan over medium heat. Whisk constantly as the mixture warms. You are watching for it to thicken significantly, which usually takes about five to eight minutes. When it is ready, it should look like a thick, glossy pudding and hold a trail when you drag the whisk through it. Remove it from the heat immediately so it does not scorch.
Pour the hot paste into a shallow bowl or spread it onto a plate to help it cool faster. This step is critical — if the paste is even slightly warm when it meets the butter, the butter will melt rather than whip, and the frosting will break into a greasy, soupy mess. Press a piece of plastic wrap directly against the surface to prevent a skin from forming, and let it cool completely to room temperature. If you are in a hurry, you can set the bowl over an ice bath and stir it gently until it feels cool to the touch.
Once the paste is fully cool, beat your softened butter in the stand mixer with the whisk attachment on medium-high speed for about four to five minutes until it is pale, fluffy, and noticeably increased in volume. Then begin adding the cooled paste one large spoonful at a time, letting each addition incorporate before adding the next. Once all the paste is in, increase the speed and whip for another three to four minutes. The frosting should transform — it will go from looking slightly curdled or cottage-cheese-like to suddenly coming together into a smooth, voluminous cloud. Add your vanilla and salt, taste, and adjust. It is ready to use immediately or can rest at room temperature for an hour or two before piping.
Tips for Getting the Best Results Every Time
- Temperature is everything. Both the paste and the butter need to be at true room temperature — not slightly warm, not slightly cool. This is the single biggest factor in whether the frosting comes together smoothly.
- If your frosting looks broken or curdled partway through mixing, do not panic and do not stop the mixer. Keep whipping. It almost always comes together with a few more minutes of agitation.
- If the frosting seems too soft to pipe after mixing, refrigerate it for fifteen to twenty minutes, then re-whip briefly. This firms up the butter without losing the texture.
- Use a fine-mesh strainer to push the cooked paste through before cooling if you notice any lumps — this only takes a moment and guarantees a silky final product.
- Taste the paste once it is cool. It should be pleasantly sweet and milky. If it tastes flat, a tiny extra pinch of salt in the final frosting will make a noticeable difference.
- For a very white frosting, you can use a touch of violet food coloring gel — just barely a toothpick tip’s worth — to neutralize the yellow tones from the butter.
Ways to Change Up the Flavor
One of the most appealing things about ermine frosting is how well it takes on other flavors without losing its characteristic lightness. Because the base is so neutral and not aggressively sweet, additions shine rather than compete.
- Brown butter version: Brown your butter in a pan until it smells nutty and toasty, then let it resolidify in the refrigerator before using it as you would regular softened butter. The flavor becomes deeply caramel-like and complex.
- Citrus: Whip in two to three teaspoons of fresh lemon or orange zest along with a tablespoon of the corresponding fresh juice at the end. The result is bright and lightly floral — excellent on carrot cake or a plain vanilla sponge.
- Strawberry: Fold in a few tablespoons of freeze-dried strawberry powder for a naturally pink frosting with genuine berry flavor. No food coloring needed and the fruitiness is concentrated and real.
- Chocolate: Melt and cool about two ounces of good-quality dark chocolate and whip it in with the paste. The frosting becomes silky and gently bitter in the best way — outstanding on a yellow butter cake.
- Cinnamon and cardamom: Stir half a teaspoon of cinnamon and a quarter teaspoon of cardamom into the flour paste while it is still warm. This version is particularly beautiful on spice cakes or apple-based bakes in the fall and winter months.
- Coffee: Dissolve a teaspoon of instant espresso powder in a tablespoon of warm milk and add it to the finished frosting. The coffee flavor is subtle but present, and it pairs wonderfully with chocolate or banana cake layers.
How to Store Ermine Frosting and Frosted Cakes
Because ermine frosting contains cooked milk and butter, it needs to be handled thoughtfully when it comes to storage. A finished bowl of frosting can sit at cool room temperature — below 70 degrees Fahrenheit — for up to two hours while you finish your cake. For longer storage, transfer it to an airtight container and refrigerate for up to five days. When you are ready to use refrigerated frosting, let it sit at room temperature for thirty to forty-five minutes, then re-whip it briefly in the stand mixer until it returns to its original fluffy texture.
A frosted cake can be kept at room temperature for up to one day if your kitchen is not too warm. Beyond that, refrigerate the cake loosely covered. Because the frosting firms up in the cold, take the cake out of the refrigerator about an hour before serving so the frosting has time to soften back to its ideal creamy texture. The frosting does not freeze especially well on its own, as the emulsion can break when thawed, but a fully frosted and assembled cake can be frozen whole — wrap it well and thaw overnight in the refrigerator, then bring to room temperature before slicing.
Save This Ermine Frosting Guide for Your Next Baking Day
Ermine frosting rewards a little patience, but the learning curve is genuinely short. After one successful batch, the method becomes almost second nature, and you will find yourself reaching for it whenever a cake or a batch of cupcakes calls for something that feels a little more special than the everyday powdered-sugar version. Whether you keep it classic with vanilla or branch into citrus, brown butter, or chocolate, this frosting has a way of elevating whatever it touches without drawing all the attention to itself — which is exactly what a great frosting should do. If these ermine frosting ideas were helpful, save this post to your Pinterest board so it is ready the next time you bake — and thank you for spending time with KitchenGuide101.
