Ultimate Mississippi Mud Cake Brownies with Marshmallows - My Home Made Recipe

Ingredients

• 1 cup (226 g) unsalted butter, melted and slightly cooled
• 2 cups (400 g) granulated sugar
• 4 large eggs, room temperature
• 2 teaspoons vanilla extract
• 1 1/2 cups (190 g) all-purpose flour
• 3/4 cup (64 g) unsweetened cocoa powder
• 1/2 teaspoon baking powder
• 1/2 teaspoon fine salt
• 4 cups (200 g) mini marshmallows
• 1 cup (110 g) chopped pecans, lightly toasted
• 1/2 cup (113 g) unsalted butter
• 1/4 cup (21 g) unsweetened cocoa powder
• 1/3 cup (80 ml) whole milk, plus more as needed
• 3 cups (360 g) powdered sugar, sifted if lumpy
• 1 teaspoon vanilla extract
• 1/4 teaspoon fine salt