Name: Gooey Mississippi Mud Brookies
Prep time: 15 min
Cook time: 25 min
Yield: 12, 12-15 slices
Cuisine: American
Ingredients: 1 Large egg; ½ teaspoon salt; 1¾ cup all-purpose flour; ½ cup granulated sugar; ½ teaspoon baking soda; ¾ cup mini chocolate chips; ½ cup light brown sugar, packed; 2 teaspoons pure vanilla extract; ½ cup (1 stick) unsalted butter; 1 Box brownie mix; Ingredients on the box (oil, eggs water); 1 ½ cups mini marshmallows, divided; 1 cup chopped pecans, divided

Gooey Mississippi Mud Brookies

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These Gooey Mississippi Mud Pie Brookies are layers of fudge chocolate brownie and chocolate chip cookies mixed with pecans and mini marshmallows.

By: Julianne Dell (via Beyondfrosting)

Original Publish: Mar 24, 2016

Last Updated: Mar 1, 2026

Prep: 15 mins

Cook: 25 mins

Yields: 12, 12-15 slices

Instructions

Preheat oven to 350°F
In a medium sized bowl, combine brownie mix, egg, vegetable oil and water according to the instructions on the box. Beat until thoroughly mixed.
Line a 9×13” pan with parchment paper or a baking mat. Pour the brownie batter over the baking mat and spread evenly.
Sprinkle the top of the batter with ½ cup crushed pecans and ¾ cup of mini marshmallows and gently press into the brownie batter.
Soften the butter in the microwave for 10-15 seconds. Combine the butter with both light brown sugar and granulated sugar. Mix until smooth and the mixture becomes fluffy.
Add the egg and vanilla extract and beat until the egg is thoroughly incorporated.