For Thumbprint Cookies: Instead of creating a crosshatch design with a fork, use your thumb to press an indentation into the center of each ball of dough. Fill the hole with about 1/4 teaspoon jam. Note: too much jam will boil out during baking.
For Chocolate Pistachio Shortbread Cookies: Substitute 2 tablespoons unsweetened cocoa powder for 2 tablespoons of the almond flour; and add 1/8 teaspoon espresso powder. Stir in 1/4 cup finely chopped pistachios. Shape the dough into a log, chill, slice, and bake for 12 to 14 minutes; or bake as directed above.
For Cranberry-Orange Shortbread Cookies: Add 1/2 teaspoon orange zest (grated orange rind) and 1/4 cup dried cranberries to the dough. Shape the dough into a log, chill, slice, and bake for 12 to 14 minutes; or bake as directed above.
For Maple Pecan Shortbread Cookies: Add 1 teaspoon cinnamon, 2 teaspoons maple syrup, and 1/3 cup diced pecans to the dough. Shape the dough into a log, chill, slice, and bake; or bake as directed above.
Find it online: https://eat-gluten-free.celiac.org/almond-flour-cookies/