In a small bowl, whisk flaxseed meal and water together; set aside for 5 minutes to thicken.
In a large bowl, cream together the softened vegan butter and 3/4 cup sugar until light and fluffy.
Add the thickened flax egg and vanilla extract to the butter mixture and beat until combined.
In a separate bowl, whisk together the flour, strawberry powder, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until a dough forms.
Cover and refrigerate the dough for at least 30 minutes.
Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
Scoop 1-tablespoon portions of dough, roll into balls, and coat in the extra sugar.
Place balls on the baking sheet 2 inches apart and flatten slightly with the palm of your hand.
Bake for 10-12 minutes or until edges are set. Allow to cool on the baking sheet for 5 minutes before transferring to a wire rack.