This mocha marble cake is perfect for coffee lovers. To make this cake, you will need all-purpose flour, baking powder, salt, unsalted butter, granulated sugar, eggs, vanilla extract, milk, cocoa powder, and instant coffee. The cake batter is divided into two parts, and one part is mixed with cocoa powder and instant coffee to create the mocha batter. The two batters are then swirled together to create the marble effect. This cake is perfect for breakfast, dessert, or any time you need a caffeine boost.