Chocolate Ganache Layer Cake

Step 1
Preheat the oven to 350 degrees F (175 degrees C). Grease two 9-inch round cake pans.

Step 2
Place butter and unsweetened chocolate in the top of a double boiler over simmering water. Stir frequently, scraping down the sides with a rubber spatula to avoid scorching, until melted, about 5 minutes.

Step 3
Combine flour, sugar, cocoa, baking soda, and salt in a large bowl using an electric mixer.

Step 4
Combine buttermilk and eggs in another bowl and add melted chocolate mixture. Beat into flour mixture on low speed for 1 minute; increase speed to high and beat until light and fluffy, about 2 minutes. Divide batter between the prepared cake pans.

Step 5
Bake in the preheated oven until the cake springs back when lightly pressed, 25 to 30 minutes. Set aside and let cool.

Step 6
Meanwhile, bring cream to a boil in a saucepan over medium-high heat. Immediately remove from heat and stir in chocolate chips until it thickens and is smooth. Allow to cool slightly, about 10 minutes.

Step 7
Place one cooled cake layer on a cake plate and spread with a layer of ganache frosting. Lay the second layer on top and use remaining ganache frosting to cover the top and sides of the cake.