The Best Monster Cookies Recipe (Chewy, Loaded & No Flour Needed)

Prep Time: 15 minutes | Cook Time: 12 minutes per batch | Total Time: 45 minutes | Servings: 36 cookies | Calories: 180 kcal per cookie

Monster cookies are packed with everything good. Peanut butter, oats, chocolate chips, and M&Ms. They are thick, chewy, and loaded with mix-ins. Best part? No flour needed.

These cookies are naturally gluten-free because they use oats instead of flour. They are dense, satisfying, and stay soft for days. Every bite has something different.

Forty-five minutes and you have three dozen cookies that disappear faster than you can put them away.

Why You Will Love This Recipe

Monster cookies are different from regular cookies. Here is what makes them special.

No flour needed. Just oats and peanut butter hold everything together. Naturally gluten-free without any special ingredients.

They are loaded with mix-ins. Chocolate chips, M&Ms, and peanut butter chips all in one cookie. Every bite is exciting.

The texture is perfect. Thick and chewy. Not cakey or hard. They stay soft for over a week in a sealed container.

They are huge. These are big cookies. One or two and you feel satisfied. Not those tiny cookies that disappear in one bite.

Kids go crazy for them. All the candy mixed in makes these irresistible to children. Adults love them just as much.

Ingredients

• 1½ cups (375g) creamy peanut butter
• 1 cup (225g / 2 sticks) unsalted butter, softened
• 1 cup (200g) granulated sugar
• 1½ cups (300g) brown sugar, packed
• 3 large eggs
• 2 teaspoons vanilla extract
• 4½ cups (405g) old-fashioned rolled oats
• 2 teaspoons baking soda
• ½ teaspoon salt
• 1½ cups (270g) chocolate chips
• 1½ cups (270g) M&Ms
• 1 cup (180g) peanut butter chips (optional)

Equipment Needed

• Baking sheets (2 or 3)
• Parchment paper or silicone baking mats
• Large mixing bowl
• Electric hand mixer or stand mixer
• Measuring cups and spoons
• Cookie scoop or spoon
• Wire cooling rack
• Spatula

Instructions

Step 1: Preheat your oven to 350°F (175°C). Line baking sheets with parchment paper.

Step 2: In a large bowl, beat together the peanut butter, softened butter, granulated sugar, and brown sugar with an electric mixer for 2 to 3 minutes. It should be light and fluffy.

Step 3: Add the eggs one at a time, beating well after each addition.

Step 4: Add the vanilla extract. Mix until combined.

Step 5: Add the oats, baking soda, and salt. Mix on low speed until everything is evenly combined. The dough will be thick.

Step 6: Stir in the chocolate chips, M&Ms, and peanut butter chips (if using) with a spatula or wooden spoon. Mix until evenly distributed.

Step 7: Scoop rounded tablespoons of dough and roll into balls. Place them on the prepared baking sheets about 3 inches apart. These cookies spread quite a bit.

Step 8: Flatten each ball slightly with your hand or the bottom of a glass.

Step 9: Bake for 10 to 12 minutes. The edges should be set but the centers will look slightly underdone.

Step 10: Remove from the oven. Let cookies cool on the baking sheet for 5 minutes. They will firm up as they cool.

Step 11: Transfer to a wire rack to cool completely.

Step 12: Repeat with remaining dough.

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Substitutes & Swaps

Peanut butter: Almond butter or sunflower seed butter work for peanut allergies. The texture will be similar.

Butter: Coconut oil works for dairy-free. Use the same amount. The cookies will spread more.

Old-fashioned oats: Quick oats work but the texture is less chewy. Do not use instant oatmeal.

Chocolate chips: Any mix-ins work. Raisins, butterscotch chips, white chocolate chips, chopped nuts. Use what you like.

M&Ms: Reese’s Pieces, Smarties, or chopped candy bars all work. Any colorful candy makes these fun.

Variations

Double Chocolate Monster Cookies: Add ½ cup cocoa powder to the dough. Use dark chocolate chips and chocolate M&Ms.

White Chocolate Cranberry Monster Cookies: Use white chocolate chips and dried cranberries instead of chocolate chips and M&Ms.

Trail Mix Monster Cookies: Add chopped nuts, dried fruit, and shredded coconut along with the chocolate chips.

Loaded Monster Cookies: Add everything. Chocolate chips, M&Ms, peanut butter chips, butterscotch chips, and chopped pretzels.

Vegan Monster Cookies: Use vegan butter and replace eggs with flax eggs (3 tablespoons ground flax mixed with 9 tablespoons water). Let sit 5 minutes before using.

Tips & Tricks

Do not overbake. These cookies should come out looking slightly underdone in the center. They firm up as they cool. Overbaked monster cookies are dry.

Space them far apart. These cookies spread. Give them 3 inches between each one or they will merge together.

Flatten slightly before baking. A gentle press helps them bake evenly. Otherwise they stay too thick in the middle.

Use natural peanut butter carefully. Natural peanut butter makes the dough oilier. If using natural, chill the dough for 30 minutes before baking.

Mix candy in last. Fold in the chocolate chips and M&Ms gently at the end. Do not beat them in with the mixer or they will break.

Make them extra large. Use a ¼ cup scoop for giant bakery-style cookies. Bake for 14 to 16 minutes.

Store properly. Keep in an airtight container at room temperature for up to 10 days. They stay soft and chewy.

Nutrition Information (Per Cookie)

Nutrient	Amount
Calories	180 kcal
Total Fat	10g
Saturated Fat	4g
Carbohydrates	20g
Fibre	1g
Sugars	13g
Protein	4g
Sodium	95mg

Nutrition is based on one cookie from a batch of 36, made with peanut butter, butter, oats, chocolate chips, M&Ms, and peanut butter chips.

Frequently Asked Questions (FAQs)

Are these really gluten-free?

Yes, as long as you use certified gluten-free oats. Regular oats are often processed in facilities with wheat.

Why are they called monster cookies?

Because they are loaded with everything. Peanut butter, oats, chocolate, candy. Like a monster truck of cookies.

Can I make these without peanut butter?

Yes. Use almond butter or sunflower seed butter. The texture stays similar.

Why did my cookies spread too much?

The dough was too warm or you did not flatten them before baking. Chill the dough if it feels too soft.

Can I freeze the dough?

Yes. Scoop into balls. Freeze on a tray until solid. Store in a freezer bag for up to 3 months. Bake from frozen adding 2 extra minutes.

How do I make them less sweet?

Use semi-sweet chocolate chips instead of milk chocolate. Reduce the M&Ms to 1 cup.

Can I use crunchy peanut butter?

Yes. It adds extra texture and crunch. The cookies will have small peanut pieces throughout.

The Cookie That Has Everything

Most cookies have one or two things going for them. Monster cookies have everything. Peanut butter. Oats. Chocolate. Candy. Chewy texture. No flour needed. These check every box.

Make a batch this weekend. Watch them disappear. Make another batch immediately because you will wish you had more.

Made monster cookies? Tell me in the comments what mix-ins you used. I want to know what everyone is loading into these cookies.