Pastel de capas de chocolate decadente __ Decadent Chocolate Layer Cake

Components
For the Chocolate Cake
2 cups all-purpose flour

2 cups granulated sugar

3/4 cup unsweetened cocoa powder

2 teaspoons baking powder

1 1/2 teaspoons baking soda

1 teaspoon salt

1 cup buttermilk, at room temperature

1/2 cup vegetable oil

2 giant eggs, at room temperature

2 teaspoons vanilla extract

1 cup boiling water

For the Chocolate Ganache
12 oz semi-sweet chocolate, finely chopped

1 1/2 cups heavy cream

2 tablespoons unsalted butter, softened

For the Chocolate Frosting
1 cup unsalted butter, softened

3 1/2 cups powdered sugar

1/2 cup unsweetened cocoa powder

1/2 cup heavy cream

2 teaspoons vanilla extract