Beat softened butter and white sugar until light and fluffy.

Mix in the egg, lemon zest, lemon juice, and food coloring if using.

Stir in flour, baking powder, and salt until just combined.

Refrigerate dough for 1-2 hours to firm up.

Preheat oven to 350F. Line baking sheet with parchment paper.

Roll 2 tablespoons of dough into balls, roll in powdered sugar, and place on baking sheet.

Bake about 12 minutes until set but still soft with cracks on the surface.

Cool on baking sheet before transferring to a wire rack.