Black and white coffee cake

I am baking and baking and cooking. I am preparing my husbands birthdays. I love to do his birthday's parties. I am waiting fort 35 guests, is not an easy task, I must confess that. So, the Friday´s recipe is just a simple coffee cake • 2 cups all-purpose flour • 3/4 cup sugar • 2 teaspoons baking powder • 1/2 teaspoon salt • 1/2 cup butter (chill) • 2 eggs • 3/4 cup milk, or as needed • 1 1/2 teaspoons vanilla extract Chocolate cake topping 50 g bitter sweet chocolate 1/3 cup. butter 2/3 cup. all- purpose flour 1/2 tsp. baking powder 2 eggs 1 cup sugar In a large bowl, combine flour, sugar, baking powder and salt. Cut in butter until mixture resembles coarse crumbs. Crack an egg into a measuring cup and then fill add milk to make 1 cup. Stir in vanilla. Add the flour mixture and mix just until incorporated. Pour the batter into the prepared pan and smooth the top. Melt chocolate and butter. Beat eggs and add sugar. Blend in chocolate and vanilla. Mix in flour, baking powder and salt. Melt chocolate and butter. Beat eggs and add sugar. Blend in chocolate and vanilla. Mix in flour, baking powder and salt. Then spoon a few tablespoons of the chocolate cake mix over the vanilla mix cake Bake in the preheated oven for 25 to 30 minutes, or until a toothpick inserted into the center of the cake comes out clean. Allow to cool.