Marble Sour Cream Coffee Cake
["3 Tbsp. cocoa", "1 3/4 c. sugar", "3/4 c. butter plus 4 Tbsp.", "2 c. flour plus 1/2 c.", "8 oz. sour cream", "2 eggs", "1 tsp. baking powder", "1 tsp. baking soda", "1 tsp. vanilla", "1/2 c. semi-sweet chocolate chips (mini)"]
["Combine cocoa and 1/2 cup sugar; set aside.", "Beat 1 cup sugar with 1/2 cup butter; add eggs and vanilla.", "Alternate dry ingredients with sour cream.", "Spread 1/2 of batter in 9-inch tube pan.", "Sprinkle with half of cocoa mixture; repeat.", "Sprinkle crumb topping over batter.", "Bake 50 to 55 minutes at 350\u00b0."]
["cocoa", "sugar", "butter", "flour", "sour cream", "eggs", "baking powder", "baking soda", "vanilla", "semi-sweet chocolate chips"]