1 tablespoon Unsalted butter, at room temperature
4 ounces Bittersweet chocolate, chopped
1/4 cup Heavy cream
2 tablespoons Heavy cream
3/4 cup Marshmallow Fluff
1 1/2 cups Confectioners’ sugar
6 tablespoons Unsalted butter, at room temperature
110 g Sugar
3/4 cup Canola oil
2 Large eggs, separated
Salt
1/4 teaspoon Baking soda
1/2 teaspoon Baking powder
1/3 cup Dutch process cocoa
80 g Cake flour
Nonstick vegetable oil spray