Preparation Steps

• Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking pan.
• In a large bowl, mix together melted butter, granulated sugar, eggs, and vanilla extract until well combined.
• In a separate bowl, whisk together flour, cocoa powder, baking powder, and salt. Gradually add to the wet ingredients, stirring until just combined.
• Pour the batter into the prepared baking pan and spread evenly.
• Bake in preheated oven for 25-30 minutes or until the top is set and a toothpick inserted into the center comes out clean.
• Remove from oven and immediately cover the top with mini marshmallows. Return to the oven for 2-3 minutes, just until the marshmallows begin to puff.
• In a saucepan over medium heat, combine butter, milk, and cocoa powder for the frosting. Stir until smooth, then gradually whisk in powdered sugar until fully incorporated. Stir in vanilla extract.
• Pour the warm frosting over the marshmallow layer and spread evenly with a spatula.
• Allow the brownies to cool completely in the pan before cutting into squares and serving.