Preheat oven to 350 F. Prepare a square 8x8 baking dish with parchment paper placing it horizontal and vertical hanging over the sides of the dish for easy removal.
Using a hand mixer, beat the eggs whites together in a large bowl until fluffy peaked. Then add the sugar, vanilla, applesauce, maple syrup and coconut oil to the eggs and beat until combined. To the batter, fold in the salt and flour. Do not over combine.
Transfer the batter to the prepared baking dish and smooth with a spatula or back of a spoon. Place in the oven and bake 30 minutes until the edges are brown.
While the crust is baking, add the cream cheese, stevia, cinnamon, cardamom, nutmeg, lemon juice and apple butter to a mixing bowl and blend together very well.
After you remove the crust from the oven, spread the cream cheese evenly over it. It should spread easily with the crust is warm.
Place in the freezer to set 3-6 hours, overnight is best.
When you're ready to eat, simply lift the parchment paper up to remove the bars from the dish and slice into 12 squares.