Generously grease a 13x9 inch baking pan. Preheat Oven to 350 degrees.

1. In a medium size bowl combine 11/4 cups light brown sugar, 3/4 cup flour, 1/2 cup butter pieces and cinnamon. Mix with a fork until topping is crumbly and butter is blended in, add chopped pecans. Set aside.

In a large bowl combine 31/4 cups flour,baking powder and baking soda. Stir to combine

3. In the bowl of an electric mixer, cream the 3/4 cup butter and sugar until light and fluffy. Beat in the eggs, one at a time, beating well after each addition. Beat in vanilla extract and vanilla yogurt. With the mixer on low speed, beat in flour mixture just until blended.

3. Spoon about 3 cups of the batter into the bottom of your prepared pan, smooth with a spatula to level it out. Sprinkle with 1/4 cup of the streusel mixture and the apples, then 1/2 cup of the streusel mixture. Spoon remaining batter over streusel apple layer. Top with remaining streusel. Press the streusel down into the batter lightly with your hand. Bake cake at 350° for 50 to 60 minutes, or until a wooden pick or cake tester inserted in center comes out clean.