Dark Chocolate Ganache Mini Sheet Cake

cake ingredients (cane sugar, flour, buttermilk, canola oil, water,, eggs, cocoa powder, baking soda, salt, vanilla extract) and ganache frosting ingredients (powdered sugar, butter, cream cheese, cocoa powder, ganache)., mini chocolate chips {sugar, unsweetened chocolate, cocoa butter, soy lecithin (emulsifier), natural vanilla flavor}.