Preheat the oven to 350°F/180°C. Line 2 baking sheets with parchment paper and set aside.
Whisk the all purpose flour, baking powder, baking soda, and salt together in a medium bowl and set aside.
330 grams all purpose flour, ½ teaspoon baking powder, 1 teaspoon baking soda, ½ teaspoon salt
In a large mixing bowl, whisk the melted butter and sugar together until well combined.
226 grams melted unsalted butter, 200 grams granulated sugar
Vigorously whisk the egg, egg yolk, vanilla extract, and lavender extract into the butter mixture until homogenous and paste-like.
1 large egg, 1 egg yolk, 2 teaspoon vanilla extract, 1 teaspoon lavender extract
Fold half of the flour mixture into the bowl of wet ingredients until only a few streaks of flour are left. Add the rest of the dry ingredients and fold until no streaks of flour remain and set aside.
Combine the sugar and dried lavender in a small bowl.
50 grams granulated sugar, 3 tablespoon dried lavender
Use a medium cookie scoop to portion the cookie dough. Roll each scoop into balls.
Drop each ball into the bowl of lavender sugar, rolling around until evenly coated. Place the balls 1-2 inches apart from each other on the lined baking trays.
Bake for 10-13 minutes until the edges are set and the middles are puffy. Let cool on the hot tray for 5 minutes, then transfer to a wire cooling rack. Let the cookies cool completely and enjoy!