Add all the wet ingredients, plus the chia seeds to a bowl and mix well until the sugar dissolves. Let it sit for a minute. (Don’t wait for too long, or the chia seeds will absorb all the moisture.)
Add flours and baking powder and salt and mix in until it is a soft dough. Add a good pinch of turmeric for color, if you wish. If the dough is too sticky, add a tablespoon more of flour. If it's too dry, sprinkle in a few drops of water or oil and mix in. Smooth out the dough and Chill for 10-15 mins. Preheat the oven to 350° F.
Take small portions of the dough and roll into a ball. Mix 1 tbsp sugar and a good pinch of salt in a small bowl. Roll the ball in the sugar bowl, then press the ball to a flat cookie on a parchment lined baking sheet. Bake for 10 to 11 mins. Cool for 5 minutes and serve.
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Notes
To make these gluten-free, mix 1/3 cup of oat flour, 1/3 cup almond flour, 1/3 cup rice flour and 2 tablespoons cornstarch or other starch. Add 1 cup of this flour instead of all purpose to the cookie and mix in. If the mixture is wet, add 1 to 2 more tablespoons of the blend.You can use poppy seeds instead of chia seeds or eliminate the chia seeds all together.Store lemon cookies on the counter for up to 2 days. Refrigerate for up to a week, or freeze for months.