In a saucepan, combine blueberries and lemon juice. Cook over medium heat until the blueberries break down and form a reduction. Let it cool.
In a mixing bowl, cream together the softened butter and 1 cup of granulated sugar. Add the egg, vanilla extract, and lemon zest. Mix well.
In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add this to the wet mixture, mixing until just combined. Fold in the blueberry reduction.
Chill the dough for at least 30 minutes. Preheat your oven to 350°F (175°C).
Roll the dough into balls and coat them in powdered sugar. Place them on a baking sheet.
Bake for 12 minutes or until the edges are set. Let cool before serving.
Notes
For a more intense flavor, you can add more lemon zest or use a bit of lemon extract in the dough.
Keyword blueberry cookies, crinkle cookies, lemon cookies