flour • sugar (I used one cup brown sugar and one cup granulated sugar) • cocoa powder • baking soda • baking powder • salt • plain yogurt or buttermilk • neutral oil (such as canola or sunflower) • vanilla extract • large eggs (or 3 small) • brewed coffee (I used 1 tablespoon instant coffee in 1 cup water)
oat flour (you can make it by blending oats) (about 75 grams) • milk (about 60 ml) • vanilla extract • baking powder • cocoa powder (optional; I added it because I wanted half cocoa cereal and half plain)
chocolate cake mix • Coca-Cola • As needed, flour for dusting the pan • As needed, butter for greasing the pan • For the frosting: • sweetened condensed milk • melted butter • unsweetened cocoa powder • Chocolate sprinkles, to taste