Soft Chewy Monster Cookies with Chocolate, Oats & Peanut Butter

Soft and Chewy Monster Cookies are packed with oats, creamy peanut butter, semi‑sweet chocolate chips, and colorful M&M candies. They bake up thick, tender, and chewy—perfect for sharing. Make a double batch; they disappear fast.

These monster cookies are a family favorite in our kitchen. With oats, peanut butter, chocolate, and candy pieces, each bite has a mix of textures and flavors that appeal to kids and adults alike.

Why You Will Love These Cookies!

• Quick and simple. No chilling required—this dough is ready to scoop and bake right away.
• Loaded with mix‑ins. Oats, peanut butter, chocolate chips, and M&M’s give these cookies a satisfying bite.
• Soft and chewy texture. The combination of peanut butter and oats yields a tender interior with a little chew.
• Customizable. Swap or add mix‑ins to suit your tastes or to make them holiday‑themed.

Ingredients You Need To Make This Recipe

• Butter — for richness and a soft crumb. Use unsalted, softened to room temperature.
• Peanut butter — adds nutty flavor and helps bind the dough.
• Granulated sugar — balances and adds structure.
• Brown sugar — contributes moisture and a hint of caramel flavor.
• Egg — binds the dough and adds lift.
• Vanilla extract — enhances overall flavor; use pure vanilla if possible.
• All‑purpose flour — the base of the cookie dough.
• Old‑fashioned rolled oats — provide texture; quick oats can be used if needed.
• Baking soda — a touch of leavening.
• Salt — balances sweetness and intensifies flavors.
• M&M milk chocolate candies — colorful, crunchy mix‑ins.
• Semi‑sweet chocolate chips — melty pockets of chocolate throughout.

How To Make This Recipe

1. Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper or use a silicone baking mat.
2. In a medium bowl, whisk together the flour, oats, baking soda, and salt. Set aside.
3. In a stand mixer fitted with the paddle attachment, or in a large bowl with an electric mixer, beat the butter, peanut butter, granulated sugar, and brown sugar until light and creamy, about 2–3 minutes. Start on low and increase speed as needed.
4. Add the egg and vanilla, mixing until combined. With the mixer on low, slowly add the flour and oat mixture and mix until no dry streaks remain, scraping the bowl as necessary.
5. Fold in the M&M’s and chocolate chips by hand or mix on low briefly. The dough will be slightly crumbly but should hold together when pressed.
6. Using a cookie scoop, portion about 3 tablespoons (roughly 60 g) per cookie. Roll into balls, then gently flatten between your palms to shape. Place cookies about 1 inch apart on the prepared baking sheet. Press a few extra chocolate chips and M&M’s onto the tops for a pretty finish.
7. Bake on the center rack for 8–10 minutes, until the bottoms are just starting to turn very light golden. The cookies will look slightly underbaked—this keeps them soft and chewy.
8. Allow cookies to cool on the baking sheet for several minutes so they set, then transfer to a wire rack to finish cooling. Serve warm or at room temperature.

Variations and Substitutions

These cookies are very forgiving—swap or add mix‑ins to make them your own. Ideas to try:

• Butterscotch chips
• Peanut butter chips
• White chocolate chips
• Chopped nuts (walnuts, pecans, or peanuts)
• Dried fruit such as raisins or chopped dried cranberries

What Are Monster Cookies?

Monster cookies are hearty, soft cookies made by combining elements of peanut butter, oatmeal, and chocolate chip cookies. They typically include oats, peanut butter, chocolate chips, and candy pieces for extra color and crunch. Versions vary—some use less flour or none at all—but the hallmark is a generous mix of add‑ins and a thick, chewy texture.

Why Is My Dough So Crumbly?

A slightly crumbly dough is normal for this recipe, but it should still hold together when pressed. If the dough is too dry, you likely measured too much flour. Measure flour by fluffing it in the container, spooning it into the cup, and leveling it off, or for best accuracy weigh flour on a kitchen scale.

Can This Cookie Dough Be Frozen?

Yes. Shape the dough into a log and wrap tightly in plastic wrap, or portion into individual cookie balls and freeze on a sheet before transferring to a freezer bag. Dough will keep up to three months. Thaw in the refrigerator before baking, or bake from frozen—just add a minute or two to the bake time.

Make-Ahead and Storing Instructions

You can prepare the dough up to three days ahead and refrigerate until ready to bake. Baked cookies keep in an airtight container at room temperature for up to one week, or frozen for up to three months.

Recommended Tools For This Recipe

• Kitchen scale (recommended for accurate flour measurement)
• Stand mixer or handheld electric mixer
• Mixing bowls
• Cookie scoop
• Baking sheet lined with parchment or a silicone mat

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