INGREDIENTS
2
semi-sweet baking chocolate bars, chopped
1 cup
flour
1/3 cup
cocoa powder
1 tsp
baking powder
1/4 tsp
salt
5 tbsp
butter, room temperature
1/2 cup
brown sugar
1/2 cup
granulated sugar
2
large eggs, room temperature
1 tsp
vanilla
3/4 cup
walnut pieces
1 cup
mini marshmallows, divided
1 cup
milk chocolate bars (about 3 1.5 ounce bars), chopped, divided