Monster Cookie Fudgy Brownies Recipe
Introduction
These Monster Cookie Fudgy Brownies combine the rich, chocolatey goodness of classic brownies with the chewy texture of oats and peanut butter, plus a fun mix of chocolate chips and candy pieces. They’re a delightful twist that delivers both fudginess and cookie-inspired flavors in every bite.

Ingredients
- Brownie mix (quantity as per package directions)
- 1/2 cup peanut butter
- 1/2 cup oats
- 1/2 cup chocolate chips
- 1/2 cup candy pieces (such as M&Ms or similar)
Instructions
- Step 1: Prepare the brownie batter according to the package instructions in a large mixing bowl.
- Step 2: Gently fold in the peanut butter, oats, chocolate chips, and candy pieces until evenly combined.
- Step 3: Pour the batter into a greased baking pan and bake according to the recommended time on the brownie mix package, or until a toothpick inserted into the center comes out fudgy with a few moist crumbs.
- Step 4: Allow the brownies to cool completely before cutting into squares and serving.
Tips & Variations
- For extra softness, use creamy peanut butter rather than chunky, or swirl peanut butter on top before baking for a marbled effect.
- Try substituting candy pieces with chopped nuts or dried fruit for different textures and flavors.
- If you prefer thicker brownies, use a smaller pan or bake a little less time to maintain fudginess.
Storage
Store brownies in an airtight container at room temperature for up to 3 days. For longer storage, refrigerate for up to a week or freeze for up to 3 months. To reheat, warm in the microwave for 10–15 seconds to bring back that soft, fudgy texture.
How to Serve
Serve this delicious recipe with your favorite sides.
FAQs
Can I use natural peanut butter in this recipe?
Yes, natural peanut butter works well, but because it can be thinner, the brownies may be slightly less dense. You might need to adjust the oats or baking time slightly to get your preferred texture.
What type of brownie mix is best for these Monster Cookie Brownies?
Use your favorite boxed brownie mix—fudgy varieties work best to complement the chewy add-ins, but cake-style mixes will also work if you prefer a lighter texture.
PrintMonster Cookie Fudgy Brownies Recipe
These Monster Cookie Fudgy Brownies combine the rich, indulgent texture of fudgy brownies with the delightful crunch and sweetness of monster cookie mix-ins like oats, peanut butter, chocolate chips, and colorful candy pieces. Perfect for anyone craving a decadent treat with a fun twist.
- Prep Time: 10 minutes
- Cook Time: 25 minutes
- Total Time: 35 minutes
- Yield: 12 brownies 1x
- Category: Dessert
- Method: Baking
- Cuisine: American
Ingredients
Brownie Base Ingredients
- 1 box brownie mix (about 18 oz)
- Ingredients called for on the brownie mix box (typically eggs, oil, and water)
Mix-Ins
- 1/2 cup creamy peanut butter
- 1/2 cup rolled oats
- 1/2 cup chocolate chips
- 1/2 cup candy-coated chocolate pieces (such as M&Ms)
Instructions
- Prepare Brownie Batter: Preheat your oven according to the brownie mix package instructions, usually 325°F to 350°F. In a large mixing bowl, combine the brownie mix with the required ingredients (eggs, oil, water) and stir until smooth and fully incorporated.
- Fold in Mix-Ins: Gently fold in the peanut butter, rolled oats, chocolate chips, and candy-coated chocolate pieces into the brownie batter, ensuring an even distribution without over-mixing.
- Bake Until Fudgy: Pour the batter into a greased or parchment-lined baking pan. Bake for the time specified on the brownie mix box, typically 20-30 minutes, or until a toothpick inserted into the center comes out with moist crumbs but not wet batter. Allow to cool before cutting into squares.
Notes
- For extra fudginess, slightly underbake the brownies and let them cool completely to set.
- Use creamy peanut butter to blend smoothly into the batter; chunkier varieties may affect texture.
- Feel free to substitute candy pieces with your favorite nuts or dried fruit for customization.
- Store brownies in an airtight container at room temperature for up to 3 days or refrigerate for up to a week.
Keywords: Monster Cookie Brownies, Fudgy Brownies, Peanut Butter Brownies, Chocolate Chip Brownies, Candy Brownies

