In a small mixing bowl, combine almond flour, melted butter and sweetener.
Mix with a fork until you have a crumbly mixture.Pour onto a 6 by 9 inch baking dish (or an 8 by 8 inch) and smooth out and pat down with the back of a spoon.
Bake in oven for 10 minutes.
Let cool.
Filling
In a mixing bowl, cream the butter, eggs and both brown sugar sweeteners.
Add the remaining ingredients and mix well.
Spoon over the top of the baked crust.
Bake on the center rack of the oven for about 25 minutes.