Prep Time::15 mins
Cook Time::15 mins
Additional Time::30 mins
Total Time:: 1 hr
Servings::16
Yield::1 9×13-inch baking dish
Ingredients
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1 cup butter, softened
1 cup packed brown sugar
¾ cup creamy peanut butter
½ cup white sugar
1 egg
1 egg yolk
2 cups all-purpose flour
1 teaspoon baking soda
½ teaspoon salt
2 cups chocolate chips
1 ½ cups miniature marshmallows
Directions
Preheat oven to 350 degrees F (175 degrees C). Grease a 9×13-inch baking dish.
Beat butter, brown sugar, peanut butter, and white sugar together in a bowl until smooth and creamy. Add egg and egg yolk and mix gently. Gradually stir in flour, baking soda, and salt just until batter is mixed. Gently fold chocolate chips and marshmallows into batter. Spread batter into the prepared baking dish.
Bake in the preheated oven until edges are lightly browned, 15 to 20 minutes. The center will set as it cools. Cool completely before slicing, about 30 minutes.