Take all the flavors of a marble cake and turn it into this delicious marble pound cake! This is the perfect Starbucks marble pound cake copycat recipe.
Preheat oven to 325 degrees. Lightly grease four loaf pans with shortening or nonstick cooking spray.
In a medium bowl, combine flour and salt for regular cake batter. Stir to mix.
In the bowl of a stand mixer, cream together 4 sticks of butter and 2 cups sugar until light and fluffy. Reduce mixer speed to medium and add in eggs, one at a time. Scrape down the sides of the bowl. Reduce mixer speed to low and, working in small batches, add in flour mixture and mix until just combined.
In a medium bowl, combine 2 1/4 cup flour, 1 cup cocoa and 2 tsp salt. Stir to mix well.
In the bowl of a stand mixer, cream together 4 sticks of butter and 2 cups sugar until light and fluffy. Reduce mixer speed to medium and add in eggs, one at a time. Scrape down the sides of the bowl. Reduce mixer speed to low and, working in small batches, add in flour and cocoa mixture and mix until just combined.
Alternating between the regular and chocolate batters, pour batters into prepared loaf pans.Using a knife, swirl to randomly mix the batters together. Bake in preheated oven for one hour. Remove from oven and cool completely.
Once the cakes are cooled, combine chocolate chips, butter and syrup in a double boiler. Heat over medium-low heat and, stirring constantly, heat until melted and smooth. Pour over cooled cakes and let sit for 5 minutes or until set.