Mix together cake flour, granulated sugar, cocoa powder, baking soda, and fine salt
Combine sour cream, whole milk, eggs, vegetable oil, strong hot coffee, and vanilla extract
Mix wet and dry ingredients together
Fold in semi-sweet chocolate chips
Bake cupcakes according to recipe instructions
Beat room temperature unsalted butter with vanilla extract and a pinch of fine salt
Gradually add powdered sugar and cocoa powder to butter mixture
Add heavy cream and mix until buttercream reaches desired consistency
Frost cooled cupcakes with chocolate buttercream
