Crumbly Coffee Cake

Prep Time: 15 mins  Cooking Time: 30 to 40 mins
Topping Ingredients:
1 cup pecans (or walnuts)
1/4 cup brown sugar
1/3 cup mini chocolate chips or minced chocolate
3/4 teaspoon cinnamon
1 tablespoon wheat flour
Cake Ingredients:
2 cups flour (I use one white and one wheat)
3/4 tablespoon baking powder
1/2 teaspoon baking soda
1/4 teaspoon salt
1 tablespoon flax meal (optional)
10 tablespoons unsalted better
3/4 cup sugar
2 large eggs
1 teaspoon vanilla extract
1 cup greek yogurt (substitute sour cream or plain yogurt)
Preheat oven to 350 degrees.  Grease a 9 inch cake pan with cooking spray. In a small bowl, mix together all topping ingredients and set aside. Meanwhile, mix the dry cake ingredients in a small bowl and set aside. Using an electric mixer to cream the butter and sugar together. Lightly beat eggs and add to the mixture, creaming with the sugar and butter. Add vanilla and yogurt and continue to mix on low.  Add the dry flour mixture slowly on a low speed. Pour 1/2 the mixture into cake pan and spread evenly. Spoon 1/2 crumbly topping on top, spreading evenly. Add the remaining cake batter into the pan, spreading evenly. Finish by spooning the remaining crumbly topping onto the top of the cake. Place cake in center of oven and bake for 40-50 minutes. Let cool 15 minutes before serving.