Preheat oven to 350° F
Line a pan with foil and spray with cooking spray. Set aside.
In a medium-sized bowl, whisk together flours, baking powder, cinnamon, nutmeg, and sea salt.
In the bowl of your mixer, add the brown sugar, eggs, butter, and vanilla until beat until very smooth (~ 3 minutes).
With mixing speed on low, gradually add flour mixture stirring just until incorporated. Stir in diced apples, raisins, and walnuts. With a spatula, spread batter evenly into prepared pan.
Bake for 35 minutes or until an inserted toothpick comes out clean. Cool completely before cutting into bars and serving.