Draw a monster face on the outside of a clear 5-ounce cup with a black permanent marker, tape a zigzag strip of black paper around the top as hair, fill with washed and dried green grapes and snap on the lid. Twenty minutes for 24; the card above scales from 12 to 48.

It stays on the outside of the cup and never touches the grapes, which is why it is drawn before filling. If a school asks, use round white sticker labels for eyes and a black paper strip for the mouth instead, and no marker at all.

Five-ounce clear cups for a class party: about 15 grapes each, the right portion for a child, and the lids fit a lunchbox. Nine-ounce deli cups for older children or a bigger snack. Any clear cup with a lid works; the lid is what makes it a single-serve sealed snack.

For children under 4, most schools require grapes halved lengthwise, so halve them for preschool and keep them whole for older classes. Grape allergy is rare but real; check the list and send one cup of green apple or honeydew with the same face for that child.

Yes: nut-free, dairy-free, gluten-free, egg-free, soy-free and vegan. They are the only snack on this list with no common allergen at all, which is why they are first. The classroom table above shows the allergens in the other nine.

Draw the cups up to a week ahead; wash and dry the grapes the night before; fill and lid the night before or the morning of. Sealed, the grapes keep two days in the fridge and sit 2 to 3 hours unrefrigerated at the party.

Yes. Green apple slices tossed in lemon juice or honeydew cubes keep the green monster; mandarin segments make a pumpkin, strawberries a vampire, purple grapes a witch. The six fruit-cup tabs above have each face.

Draw the face on the lid instead, or use the sticker version: two white round labels for eyes, a strip of black washi tape for the mouth. The face still reads as a monster through the green grapes.

About 15 grapes or two-thirds of a cup per 5-ounce cup, which is roughly 4 pounds of grapes for 24 cups. Buy 10 percent extra; some grapes are too soft or split.

Lids on, in a shallow box or a baking tray with a towel in the bottom so they do not slide, cups touching each other. They stack two high with lids on if the box is tall enough.

Tangerine pumpkins, witch hat popcorn cones, spider web hummus cups (sesame, not nuts), banana ghosts, broomstick pretzel rods and caramel apple slices all hold 2 hours unrefrigerated and contain no nuts. The table above has every snack’s allergens and timing.

Yes with beef or turkey mini hot dogs, which is how they are written here, and a crescent dough without pork fat (most are vegetable shortening; check the label). Serve warm from the oven; they are the one item on the list that needs to be hot.

The grape cups or the tangerine pumpkins: both are under 20 minutes for a class, no cooking, and nothing to clean. Banana ghosts are third, as long as they are made within two hours of the party.

The best class tables have one of these cups per child plus two of the other snacks: something savory (mummy dogs or hummus cups) and something sweet (broomstick pretzels or caramel apple slices). Three items, one tray, done.