Photo: Nigel Cox; Styling: Tiziana Agnello
Hands-on Time
33 Mins
Total Time
1 Hour 31 Mins
Yield
Serves 16 (serving size: 1 wedge)

How to Make It

Step 1

Preheat oven to 350°.

Step 2

To prepare cake, combine first 3 ingredients in a small bowl; let stand 1 minute. Stir until smooth; set aside.

Step 3

Weigh or lightly spoon flour into dry measuring cups; level with a knife. Combine flour, baking powder, baking soda, and 1/4 teaspoon salt in a bowl, stirring with a whisk. Place granulated sugar, buttermilk, and oil in a large bowl; beat with a mixer at low speed until blended. Add chocolate mixture; beat at low speed 1 minute. Add flour mixture; beat at low speed just until combined.

Step 4

Combine egg whites and cream of tartar in a medium bowl. Using clean, dry beaters, beat egg white mixture with a mixer at high speed until stiff peaks form (do not overbeat). Gently stir one-third of egg white mixture into chocolate mixture. Fold in remaining egg white mixture. Divide the batter evenly between 2 (8-inch) round metal cake pans coated with baking spray. Bake at 350° for 18 minutes or until a wooden pick inserted in center comes out with moist crumbs clinging. Cool for 10 minutes in pans on a wire rack. Remove cake from pans, and cool completely on wire rack.

Step 5

To prepare frosting, place cream cheeses, 2 tablespoons flour, vanilla, and 1/8 teaspoon salt in a large bowl. Beat with a mixer at medium speed for 2 minutes or until smooth. Add powdered sugar; beat 1 minute or until well combined. Gently stir in marshmallow creme just until combined.

Step 6

Place 1 cake layer on a plate; spread with 1 cup frosting, leaving a 1/2-inch border around edge. Top with remaining cake layer. Spread remaining frosting over top and sides of cake. Refrigerate the cake until ready to serve.

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