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Monster Cookie Fudgy Brownies Recipe

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4.9 from 131 reviews

Delight in these Monster Cookie Fudgy Brownies, combining rich, fudgy brownie batter with the classic flavors of peanut butter, hearty oats, and melty chocolate chips. This recipe swirls creamy peanut butter into a decadent brownie base for an irresistible treat that blends chewy texture with luscious chocolate goodness.

Ingredients

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Brownie Batter

  • 1 cup unsalted butter, melted
  • 2 cups granulated sugar
  • 4 large eggs
  • 1 teaspoon vanilla extract
  • 1 cup all-purpose flour
  • 3/4 cup unsweetened cocoa powder
  • 1/2 teaspoon salt

Add-ins

  • 1/2 cup creamy peanut butter
  • 1 cup old-fashioned oats
  • 1 cup semi-sweet chocolate chips

Instructions

  1. Prepare the brownie batter: In a large bowl, combine melted butter and granulated sugar, mixing until smooth. Add eggs one at a time, stirring well after each addition, then mix in vanilla extract. In a separate bowl, whisk together flour, cocoa powder, and salt. Gradually add the dry ingredients to the wet mixture until just combined, being careful not to overmix.
  2. Add oats and chocolate chips: Fold the oats and chocolate chips gently into the batter, ensuring an even distribution without overworking the mixture.
  3. Swirl in peanut butter: Pour batter into a greased 9×13-inch baking pan. Drop spoonfuls of peanut butter over the top, then use a knife or skewer to swirl it throughout the batter for a marbled effect.
  4. Bake the brownies: Preheat the oven to 350°F (175°C). Bake the batter for 25-30 minutes until the edges are set but the center remains fudgy. Test doneness by inserting a toothpick—expect moist crumbs but no raw batter.
  5. Cool and serve: Allow the brownies to cool completely in the pan before cutting into squares. This ensures they hold their fudgy texture and slice cleanly.

Notes

  • Use creamy peanut butter for easy swirling; chunky can be used for added texture.
  • Do not overbake to maintain fudginess; check brownies at 25 minutes.
  • For a nut-free option, substitute peanut butter with sunflower seed butter.
  • Store brownies in an airtight container at room temperature for up to 4 days or refrigerate to extend freshness.
  • Oats add chewy texture and a subtle nutty flavor, complementing the rich chocolate.

Keywords: monster cookie brownies,fudgy brownies,peanut butter brownies,oat brownies,chocolate chip brownies,dessert recipe

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