Chocolate Cake – 3/4 cup (95g) all-purpose flour (or gf baking flour) – 2 tbsp cornstarch – 1/4 cup (25g) dutch process cocoa powder – 1 tsp baking soda – 1/2 tsp baking powder – 1/4 tsp kosher salt – 1/2 cup (100g) fine granulated sugar – 1/2 cup (105g) dark brown sugar, packed – 1/2 cup (112g) vegetable or olive oil – 2 large egg – 1 tsp vanilla extract – 1/2 cup (120g) sour cream – 1/2 cup (120g) hot coffee Chocolate Cake Soak – 1/2 cup (120g) hot coffee – 1 tbsp dutch process cocoa powder