This marble loaf cake recipe is perfect for anyone who wants to make a simple and delicious dessert. This cake is made with all-purpose 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 and baked in a loaf pan to create a beautiful swirl pattern. This cake is moist, tender, and has a delicious chocolate and vanilla flavor. It's perfect for any occasion and is sure to satisfy your sweet tooth.