Best Sour Cream Coffee Cake

Directions

1. 1
   Preheat the oven to 350 degrees F and grease an 8-cup tube pan or 8-inch cake pan.
2. 2
   If you'd like to glaze your coffee cake, mix together 1 cup of powdered sugar, 1 tsp. vanilla extract, 1/2 tsp. ground cinnamon, and 3 tbsp. milk and drizzle over the top of the cake.
3. 3
   Mix walnuts, brown sugar, and cinnamon to make topping and set aside.
4. 4
   Stir or sift flour with baking powder, baking soda, and salt until dry ingredients are well combined.
5. 5
   Cream the butter with the sugar until the mixture is light, then beat in the eggs and vanilla.
6. 6
   Add the flour mixture in alternate thirds with the sour cream, beating well after each addition.
7. 7
   Spoon half the batter into the pan and sprinkle with half the topping, then add remaining batter and sprinkle on the rest of the topping.
8. 8
   Bake for 40 minutes without opening the oven, then test for doneness (a toothpick should come out clean). Coffee cake may need another 5 to 10 minutes of baking.