Preheat oven to 335° F and prepare cake pans with nonstick cooking spray and parchment circles.
In a large mixing bowl, combine white cake mix, all-purpose flour, granulated sugar, salt, milk, sour cream, melted butter, egg whites, and almond extract.
Use an electric hand mixer to mix the ingredients on low speed until combined.
Once the ingredients are combined, turn the speed on the mixer to medium and mix for a full 2 minutes.
Portion the cake batter into your cake pans and use an offset spatula to spread the batter evenly in the cake pans.
Bake for approximately 30 minutes for 7 and 8 inch round baking pans. Baking times may vary depending upon your pan sizes.
Remove the pans from the oven. Allow cakes to cool in the pan for about 15 minutes. Remove the cake layers from the pan and transfer to a wire rack to cool completely.