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1
Preheat the oven to 350 degrees F.
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2
Butter one 4 x 3-inch round cake pan, one 6 x 3-inch round cake pan and one 8 x 3-inch round cake pan.
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3
Line the bottoms with parchment paper, and butter and flour the pans.
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4
Sift the flour, cocoa, baking soda, and salt together in a medium bowl.
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5
In the bowl of an electric mixer fitted with a paddle attachment, cream the butter and sugars on high speed until light, approximately 5 minutes.
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6
Add the eggs and vanilla and mix well.
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7
Combine the buttermilk, sour cream, and coffee.
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8
On low speed, add the flour mixture and the buttermilk mixture alternately in thirds, beginning with the buttermilk mixture and ending with the flour mixture.
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9
Mix the batter only until blended.
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10
Divide the batter between the three pans and smooth the tops with a spatula.
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11
Bake on the middle rack of the oven as follows: for the 4-inch pan 45 to 50 minutes, or until a toothpick comes out clean; for the 6-inch pan 70 to 75 minutes, or until a toothpick comes out clean; and for the 8-inch pan 85 to 90 minutes, or until a toothpick comes out clean.
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12
Cool the cakes in the pans for 10 minutes each on a cooling rack, carefully remove from the pans and allow to finish cooling.
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13
For the frosting, place the chocolate chips and heavy cream in a bowl set over a pot of simmering water, stirring occasionally, until the chips are completely melted.
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14
Off the heat, add the corn syrup and vanilla and allow the chocolate mixture to cool to room temperature.
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15
In the bowl of an electric mixer fitted with the whisk attachment, whisk the chocolate mixture and softened butter on medium speed for a few minutes, until it's thickened.
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16
Place a dollop of the frosting on a serving plate to hold the bottom cake layer in place.
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17
Place the 8-inch cake on the plate, flat side up.
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18
Frost the top and sides of that layer.
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19
Place the 6-inch cake in the center of the top of the 8-inch cake, flat side up, and frost the top and sides.
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20
Place the 4-inch cake in the center of the top of the 6-inch cake, flat side down, and frost the top and sides.
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21
Pipe any remaining frosting decoratively around the cake and decorate with the candy-coated chocolates.