Ingredients For sour cream coffee cake

• STREUSEL TOPPING
• 1 c all purpose flour
• 1 c brown sugar
• 1/4 c sugar
• 2 Tbsp cinnamon
• 1/2 c butter (1 stick)
• 3/4 c chopped walnuts
• SOUR CREAM COFFEE CAKE
• 2 c all purpose flour
• 1 tsp baking soda
• 1 tsp baking powder
• 1/2 tsp salt
• 1/2 c butter
• 1 c sugar
• 2 large eggs
• 1 tsp vanilla
• 1 1/4 c sour cream