INGREDIENTS
For cake
3/4 cup all-purpose flour
1/4 cup dark or dutch processed cocoa powder
1/2 teaspoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon kosher salt
4 large eggs, room temperature
3/4 cup granulated sugar
1 teaspoon vanilla extract
1/2 teaspoon instant espresso powder
1/4 cup unsalted butter, cut into cubes
2 ounces dark chocolate (60-70%), finely chopped
For filling
6 tablespoons unsalted butter, room temperature
2 tablespoons unflavored vegetable shortening, room temperature
8 ounces marshmallow fluff
1 cup powdered sugar, sifted (more as needed)
1/4 cup heavy cream
For glaze
4 ounces dark chocolate (60-70%), finely chopped
3/4 cup heavy cream
1 tablespoon salted butter, cut into cubes
DIRECTIONS