Preheat and Prepare: Preheat the oven to 350°F. Spray a 15" x 10" x 1" jelly roll pan with nonstick cooking spray.
non-stick cooking spray
Mix the dry ingredients: In a large bowl, whisk together the flour, whole wheat flour, baking powder, baking soda, cinnamon, nutmeg, and salt.
1 cup flour, 1 cup whole wheat flour, 2 teaspoons baking powder, 1 teaspoon baking soda, 1 teaspoon cinnamon, ½ teaspoon nutmeg, ¼ teaspoon salt
Mix the wet ingredients: Add the brown sugar, maple syrup, applesauce, water, and eggs, whisking until well combined.
½ cup firmly packed brown sugar, ½ cup pure maple syrup, ½ cup unsweetened applesauce, ½ cup water, 1 can pumpkin puree , 2 eggs
Bake the cake: Pour the batter into the prepared pan. Bake for 22–28 minutes, or until a toothpick inserted in the center comes out clean. Cool completely.
Make the frosting: In a medium bowl, beat the whipped cream cheese, powdered sugar, and vanilla with an electric mixer until smooth.
12 ounces whipped cream cheese, ½ cup powdered sugar, 2 teaspoons vanilla
Frost the cake: Spread the frosting evenly over the cooled cake. Refrigerate to help the frosting set.