Preheat your oven to 375F and line two rimmed baking sheets with parchment paper, or spray with non stick cooking spray.
Using a large mixing bowl, cream the butter, brown sugar, and granulated sugar for 4-5 minutes, or until fluffy.
½ cup butter, ½ cup brown sugar, ⅔ cup sugar
Mix in the eggs, lemon juice, vanilla extract, and sour cream until fully combined.
1 large egg, 1 tablespoon lemon juice, 1 teaspoon vanilla extract, ¼ cup sour cream
Add the flour, baking powder, crushed graham crackers, and salt. Mix until combined.PRO TIP: If using whole Graham Crackers, pace them in a food processor and gently pulse, or place in a plastic bag and crush with a rolling pin. Set aside ½ cup of graham cracker crumb in a bowl for later. 2 cup flour, 1½ teaspoon baking powder, ¼ teaspoon salt, ¼ cup Graham Cracker crumbs
Fold in the fresh blueberries. Fresh blueberries work best, if using canned or frozen, drain first.
1 cup blueberries
Scoop a ball of cookie dough and roll it the small bowl filled with crushed graham crackers. Place on the baking sheet and flatten to about 1" thick patty.
½ cup Graham Cracker Crumbs
Bake the cookies 13-14 minutes in the preheated oven. Let the cookies cool on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.
To make the glaze, combine the powdered sugar, lemon juice, and milk in a small bowl until smooth. Drizzle the icing over the cookies. Let sit until glaze has set.
½ cup powdered sugar, 1 teaspoon lemon juice, 3 tablespoon milk