Make the chocolate ganache by combining chocolate chips and heavy cream. Microwave in 1-minute increments, whisking until smooth. Add melted butter and whisk until incorporated. Set aside to cool.
Whisk together flour, sugar, brown sugar, baking soda, baking powder, espresso powder, and salt.
Combine melted butter, oil, cocoa powder, hot coffee, and sour cream until smooth. Fold in dry ingredients, then add eggs, vanilla extract, and milk. Mix until combined.
Divide batter between two 8-inch cake pans. Bake for 35-40 minutes, until a toothpick comes out with a few crumbs. Let cool completely.
Place one cake on a stand, spread half the ganache on top, then place the second cake and ice with the remaining ganache.
Notes
Let the ganache set at room temperature for at least 30 minutes before using for a smooth frosting texture.