If you're looking for a gluten-free option, this marble cake recipe is perfect for you. This cake is made with gluten-free flour, baking powder, salt, unsalted butter, granulated sugar, eggs, vanilla extract, milk, and cocoa powder. The cake batter is divided into two parts, and one part is mixed with cocoa powder to create the chocolate batter. The two batters are then swirled together to create the marble effect. This cake is moist, tender, and has a beautiful swirl pattern. It's perfect for anyone who is gluten intolerant or has celiac disease.