Crust. Preheat oven to 350F. Blend almond flour, coconut flour, powdered erythritol, and melted butter in a food processor. Add 1 egg and blend until the mixture starts …
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Brush the top of each cookie with egg wash, and sprinkle with cinnamon sugar mixture or Christmas sprinkles. Bake for 8 - 10 minutes. Baking them longer will create a more crisp cookie, but you don't want them too dark either. I prefer most of my cookies soft and chewy, but Amish sand tart cookies are the best when they are thin and crunchy.
There is a variety of sand tart cookie recipes available, and some recipes are for drop sand tarts. But we always made cut-out sand tarts. It's so much fun using Christmas cookie cutters and cutting cookies into cute shapes. Some sand tart recipes, however, are hard to handle.
If you use a muffin tin for your sugar-free butter tarts, you will need to wait until they are completely cooled and set before trying to remove them. If you try to remove them before they are completely set, they will fall apart. This is why I prefer individual tart pans for this dessert.