Desserts

Desserts Kid-friendly

Monster Cookies

Name: Monster Cookies
Total time: 35 min
Yield: 10 servings
Cuisine: Desserts
Ingredients: 1/2 cup unsalted butter, softened; 1 cup creamy peanut butter; 1 cup packed brown sugar; 1/2 cup granulated sugar; 2 large eggs; 1 tsp vanilla extract; 1 tsp baking soda; 3 cups old-fashioned rolled oats; 1 cup mini M&M's candies; 1 cup mini chocolate chips; 20 small candy eyes (for decorating)

Big, chewy oatmeal cookies loaded with peanut butter, M&M's, and chocolate chips — a playful, googly-eyed Halloween party favorite.

35 minutes

Serves 10

Dessert

12 min prep

19 min cook

Contains common allergens

Egg Dairy Peanut

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Instructions

6 steps

1
Preheat the oven to 350°F (175°C) and line two baking sheets with parchment paper.
2
In a large bowl, cream together the butter, peanut butter, brown sugar, and granulated sugar until light and fluffy.
3
Beat in the eggs one at a time, then stir in the vanilla extract and baking soda.
4
Fold in the rolled oats, M&M's, and chocolate chips until evenly combined.
5
Scoop heaping tablespoons of dough onto the prepared sheets, spacing 2 inches apart, and press a couple of candy eyes onto each.
6
Bake for 10-12 minutes, until the edges are set but the centers still look soft. Cool on the pan for 5 minutes before transferring to a wire rack.

Listahan Family Score™

72/100

Good fit for most families

Allergen-friendly 70

Kid-friendly 85

Weeknight-easy 64

Budget-friendly 84

Great leftovers 71

Pantry-friendly 45

Score reflects how well this recipe fits a typical busy household. In the app, your Family Score is personalized to your household's allergens, kids, and pantry.

Nutrition

per serving

555

Calories

13 g

Protein

66 g

Carbs

29 g

Fat

Estimated per serving. Actual values depend on the brands and portions you use.

Listahan cooking guide

Chef notes & practical guide

Technique notes, ingredient swaps, serve-alongside ideas, storage guidance, and equipment for this recipe.

Cultural context

Monster cookies are closely tied to American home baking, especially the kind of big-batch cookie recipes passed around through school events, potlucks, and community cookbooks. The name fits the format: an oversized oatmeal-peanut butter cookie with several mix-ins packed into one dough, more playful than polished.

Listahan note

This version leans into the Halloween party angle by using mini candies, mini chocolate chips, and candy eyes so every cookie has a busy, silly look without needing icing or extra decorating work.

Technique cues

Pull the cookies when the edges are set and the centers still look soft. The oats keep absorbing moisture as they cool, so fully firm centers in the oven can turn dry later.
Use old-fashioned rolled oats, not instant oats, for a chewy cookie with visible texture. Instant oats make the dough denser and less nubby.
Press the candy eyes on before baking so they settle into the dough, but keep them near the surface where they stay visible after the cookies spread.

Kitchen flow

Parallel prep: Line the baking sheets while the oven heats, then measure the oats and mix-ins before creaming the butter mixture so the dough comes together quickly.
Make-ahead: Mix the dough a day ahead and refrigerate it covered; let it sit at room temperature until scoopable before baking.
Leftover move: Crumble a cookie over vanilla ice cream or a yogurt bowl when it is too broken to serve neatly.
Cleanup rhythm: Scrape the peanut butter measuring cup and mixing bowl right away, then let the parchment catch most of the melted chocolate and candy smudges.

Ingredient brief

Role, handling, and swap guidance for each key ingredient.

Creamy peanut butter

Flavor base and binder

Purpose: Peanut butter gives these cookies their sturdy chew and helps hold the oat-heavy dough together.

Handling: Use a well-stirred creamy peanut butter so the fat and solids mix evenly into the butter and sugars.

Adaptation: A no-stir almond or sunflower seed butter changes the flavor and may make the cookies spread a little differently.

Unsalted butter, softened

Richness and spread control

Purpose: Soft butter creams with the sugars to make the cookies tender instead of dense.

Handling: Let it soften until it dents easily but is not melted or greasy.

Adaptation: Salted butter can work; expect a slightly saltier dough.

Packed brown sugar

Moisture and chew

Purpose: Brown sugar keeps the cookies softer and adds a deeper caramel note next to the peanut butter.

Handling: Pack it firmly into the measuring cup so the dough has the right moisture balance.

Adaptation: More granulated sugar in its place makes the cookies crisper and less chewy.

Old-fashioned rolled oats

Cookie structure

Purpose: Rolled oats give monster cookies their hearty texture and keep the dough from baking up flat and slick.

Handling: Fold them in evenly so each scoop has enough oats to hold its shape.

Adaptation: Quick oats make a softer, more compact cookie; avoid steel-cut oats here.

Mini M&M's candies

Color and crunch

Purpose: The small candies distribute well through heaping tablespoon portions and give each bite a little candy shell snap.

Handling: Fold gently so the colors do not smear into the dough.

Adaptation: Chopped chocolate candies or candy-coated chocolate pieces give a similar party-cookie effect.

Candy eyes

Decoration

Purpose: They turn the cookies into Halloween monsters without needing frosting or piping.

Handling: Press two onto each dough mound before baking and keep them slightly apart so they do not merge as the cookie spreads.

Adaptation: Extra mini M&M's can stand in for eyes if you want the same playful look with ingredients already in the dough.

Technique notes

Cream the butter, peanut butter, and sugars until the mixture lightens slightly; under-creaming makes the cookies heavier.
Space the scoops well because the dough spreads enough for the candy eyes to shift if the cookies touch.
Cool the cookies on the pan for the full 5 minutes before moving them, since the soft centers need that time to set.

Ingredient swaps

Peanut-butter direction: Use a thick no-stir sunflower seed butter or almond butter for a different base flavor; the dough may need a few extra oats if it feels loose.
Candy mix-in path: Swap some of the mini M&M's for chopped pretzels for a saltier crunch and less overall sweetness.
Dairy-free direction: Use a plant-based butter stick and dairy-free chocolate-style candies or chips, knowing the cookies may spread a bit more and taste less buttery.
Smaller-cookie path: Use level tablespoons instead of heaping ones and start checking around 8 minutes so the centers stay soft.

Serve alongside

Cheddar popcorn
Caramel apple slices
Pretzel snack mix
Vanilla ice cream
Cold milk
Hot apple cider
Decaf coffee

Serving suggestions only — check pairings for your household's allergens.

Storage & reheating

Refrigerate baked cookies in a sealed container for up to 1 week, with parchment between layers if the candy eyes are delicate.
Warm one cookie on a plate for a few seconds in the microwave to soften the center and loosen the chocolate chips.
Freeze scooped dough portions on a tray, transfer to a sealed bag, then bake from frozen with an extra minute or two as needed.

Equipment

Two rimmed baking sheets
Parchment paper
Large mixing bowl
Wire cooling rack

Make this household-aware

Listahan Pro checks this recipe against your household's allergens, finds pantry-aware swaps, builds the shopping list, and helps you plan the week around it.

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