- 1/2 cup unsalted butter, cut into pieces
- 12 ounces dark chocolate chips
- 1/2 cup granulated sugar
- 1/2 cup dark brown sugar
- 1/2 teaspoon salt
- 2 large eggs
- 3/4 cup all-purpose flour
- 1 cup miniature marshmallows
- 1/2 cup chopped cashews
Preheat oven to 350F degrees. Butter 8-inch baking pan. Line bottom with parchment paper. Butter paper.
In heatproof bowl set over (not in) saucepan of simmering water, combine butter and 1 cup chocolate chips. Heat and stir occasionally until just melted.
Remove mixture from heat and stir in sugars, salt and then eggs. Mix in flour, stirring just until combined. Spread batter evenly in prepared pan. Bake until toothpick inserted comes out with moist crumbs, 30 to 35 minutes.
Remove from oven, and sprinkle with remaining chocolate chips, then marshmallows and nuts. Bake until chocolate is shiny and marshmallows are puffed, about 5 minutes. Cool completely in pan.
Using parchment paper overhang, lift cake onto work surface and cut into squares.