1. Get Ready to Bake: Preheat your oven to 350°F (175°C).
2. Cream It Up: In a spacious bowl, beat the softened butter and powdered sweetener until the mixture is light and fluffy. Then, blend in the egg and your chosen extracts until smooth.
3. Go Green! Carefully add a tiny bit of green gel food coloring to the batter. Mix it in well, adding more drops as needed until you achieve that perfect Grinchy green hue.
4. Whisk Dry Ingredients: In a separate bowl, combine the almond flour, coconut flour, arrowroot starch, xanthan gum, baking powder, and salt. Give them a good whisk to make sure they're all mixed together evenly.
5. Form the Dough: Gently pour the dry ingredients into the green wet mixture. Stir everything thoroughly until a thick, uniform dough forms.
6. Shape and Bake: Lightly grease a baking sheet. Roll small portions of the dough into balls, then arrange them evenly spaced on the sheet. Lightly flatten each cookie. Bake for 9-11 minutes until the bottoms are lightly golden. Don't worry if they feel soft; they'll firm up as they cool.
7. Cool Down: Let the cookies cool completely on the baking sheet before carefully transferring them to a plate or wire rack. This helps them set.
8. Prepare the Icing: For the heart decoration, mix the powdered sweetener, meringue powder, and water in a small bowl until the icing is thick enough to pipe. Stir in the red gel food coloring to get a vibrant red.
9. Decorate with Hearts: Transfer the red icing to a small zip-top bag and snip off a very tiny corner (or use a piping bag with a fine tip). Pipe small heart shapes onto your cooled green cookies. You can just outline the hearts or fill them in completely.
10. Set and Serve: Allow the red icing to harden on the cookies before sharing your festive, healthy treats!