6 oz (170g) fresh blueberries, washed and patted dry
1 tablespoon cornstarch
1 ¾ cups (215g / 7.5oz) all purpose flour
1 ½ teaspoons baking powder
¼ teaspoon salt
pinch of cinnamon
½ cup (113 g / 4 oz) unsalted butter, at room temperature
½ tablespoon lemon zest
¾ cup + 2 tablespoons (180g) sugar
1 medium egg, at room temperature
1 teaspoon vanilla
For the lemon glaze
1 ½ cups (200g) powdered sugar (+more if needed)
3-5 tablespoons fresh lemon juice
Instructions
Make the cookies
Mix the cornstarch and the blueberries together in a small bowl. Set it aside.
1 tablespoon cornstarch, 6 oz (170g) fresh blueberries, washed and patted dry
In another bowl, combine the flour, cinnamon, baking powder and salt. Set it aside.
1 ¾ cups (215g / 7.5oz) all purpose flour, 1 ½ teaspoons baking powder, pinch of cinnamon, ¼ teaspoon salt
In a large bowl, beat the butter, lemon zest, and sugar together for about 5 minutes, until everything is thoroughly combined.
½ cup (113 g / 4 oz) unsalted butter, at room temperature, ½ tablespoon lemon zest, ¾ cup + 2 tablespoons (180g) sugar
Add the egg and the vanilla and beat until fully incorporated.
1 medium egg, at room temperature, 1 teaspoon vanilla
Gradually add the flour mixture and mix until just combined. You don't want to overmix the dough because it will make the cookies tough.
Gently fold in the blueberries. It's OK if a few get smooshed.
Put the dough in the freezer for 10 minutes.
Meanwhile, preheat the oven to 350℉ / 180℃ and line three baking sheets with parchment paper.
Remove the dough from the freezer. Scoop the cookie dough with a small cookie scoop. Alternatively, use a tablespoon. Each dough ball should be about 1½ tablespoons. You could also weigh them. Mine weighed about 25g/1oz each.
Place the dough balls on a cookie sheet, each about 3 inches (8cm) apart. I fit 9 on one sheet and bake the cookies one sheet at a time.
Bake the cookies for 15-17 minutes. The edges will be lightly golden brown.
Remove the cookies from the oven and leave them on the baking sheet for about 5 minutes before transferring them to a wire rack to cool completely.
Repeat with the remaining cookie dough.
Make the lemon glaze
Whisk together the lemon juice and the powdered sugar. If it's too thin, add more powdered sugar. If it's too thick, add more lemon juice.
3-5 tablespoons fresh lemon juice, 1 ½ cups (200g) powdered sugar (+more if needed)