Cinnamon Streusel Coffee Cake

TOPPING:
1/3 c chopped walnuts
1/3 c firmly packed brown sugar
3 tbls flour
1 tbls cinnamon

COFFEE CAKE:
1 ¼ c sugar
1/3 cup cooking oil
2 large eggs
3 c flour
1 tsp baking powder
1 tsp baking soda
½ tsp salt
1 ½ c buttermilk
1 tbls vanilla

•In small bowl, combine topping ingredients.
•Coat a 12-cup bundt or tube pan with cooking spray, sprinkle 1/3 c topping mixture.
•Preheat oven to 350º.
•In large bowl, combine sugar and oil. Add eggs, one at a time, beating well.
•In separate bowl, combine flour, baking powder, soda and salt. Stir until well mixed. Add the flour mixture to the egg mixture alternately with the buttermilk, beginning and ending with the flour mixture. Mix well after each addition. Stir in vanilla.
•Set aside 2 cups batter. Pour remaining batter into prepared pan.
•Sprinkle remaining walnut mixture over batter. Pour reserved batter over walnut mixture.
•Bake 45-55 minutes or until a wooden toothpick inserted in center of coffee cake comes out clean.

Cool on a wire rack before removing coffee cake from pan.

Source: I think one of you made this as a 4-H project, right?