Apple Walnut Cake

Ingredients
1 1/2 cups all purpose flour
1/2 whole wheat flour
1 tsp baking soda
2 tsp baking powder
1 tsp ground cinnamon
1 tsp salt
2 cups of Sugar (or to make it Sugar Free - use sugar substitute)
1 cup vegetable oil
1/2 cup plain Greek yogurt
2 eggs
2 tsp vanilla extract
1 cup chopped walnuts
3 cups apples chopped (I left mine unpeeled, but you can do it either way)

Instructions
- Preheat oven to 350 degrees. Grease and flour a 9"x13" pan
- In a medium-sized bowl, sift the flours, baking soda, baking powder, cinnamon, and salt.
- In a large bowl, mix sugar, oil, eggs, and vanilla until well blended. Beat the dry ingredients into the wet, just until blended; stir in nuts and apples.
- Bake for 1 hour, until a toothpick inserted comes out clean. Cool 10 minutes in the pan; invert onto a rack to finish cooling.