Mocha Layer Cake with Chocolate-Rum Cream Filling

Ingredients:

For the cake:

2 cups all-purpose flour

2 cups granulated sugar

3/4 cup unsweetened cocoa powder

2 tsp. baking soda

1 tsp. baking powder

1 tsp. salt

1 cup buttermilk, at room temperature

1/2 cup vegetable oil

2 large eggs, at room temperature

2 tsp. vanilla extract

1 cup hot coffee

For the filling:

8 oz. semisweet chocolate, chopped

1/2 cup heavy cream

1/4 cup dark rum

For the frosting:

1 cup (2 sticks) unsalted butter, at room temperature

4 cups powdered sugar

1/2 cup unsweetened cocoa powder

1/4 cup heavy cream

1 tsp. vanilla extract