Ingredients
Method
Preparation
- Line the bottom and sides of an 8-inch-square baking pan with parchment paper or foil coated with cooking spray.
- Whisk flour, baking powder, and salt together in a small bowl.
Batter Mixing
- Melt butter in a medium saucepan until sizzling.
- Remove from heat and stir in cocoa powder and sugar.
- Add egg, egg whites, and vanilla, stirring until smooth and glossy.
- Stir in the flour mixture until just incorporated and mix for about 50 strokes.
Chilling
- Scrape the batter into the prepared pan and spread it evenly, then refrigerate for a few hours or up to 12 hours.
Baking
- Preheat oven to 350°F when ready to bake.
- Quarter marshmallows with an oiled knife and distribute over the batter, pressing them in.
- Sprinkle chocolate chips over the top.
- Bake until marshmallows are golden brown, about 25-35 minutes.
- Let cool completely in the pan on a wire rack for about 2 hours before cutting into 16 brownies.
Notes
Serve at room temperature, pair with cold milk or hot coffee, and optionally provide bowls of extra chocolate chips or chopped nuts for guests.
