Add the Alulose and lemon zest to a large bowl and use your fingertips to mix them together. This helps to release more essential oils from the zest.
Add the melted butter and vanilla and whisk until combined.
Add the eggs and whisk well.
Add the lemon juice and whisk until smooth.
In a separate bowl, whisk together the gluten-free flour blend, almond flour, baking powder, and salt, and add them to the wet ingredients.
Mix with a rubber spatula until you get a smooth, batter-like cookie dough.
Tip: At this stage, the cookie dough will really be more like a batter – very soft and sticky, bordering on runny. That's how it should be. Don't add more flour!
Chill the cookie dough in the fridge for at least 2 hours before proceeding to the next step, even better if you leave it overnight and make your cookies the next day.
Shaping & coating the cookies:
Preheat the oven to 350ºF (180ºC).
Line 2 large baking sheets with parchment paper.
Shape about 1 tablespoon portions of the chilled cookie dough into balls. You should get 15 - 25 cookies in total.
Roll each ball first in granulated sugar substitute and then in powdered sugar until it's fully coated.
Tip: If you want to have a very cute crinkle pattern, roll the cookies in granulated sugar first and then coat them in powdered sugar.