• 1 1/2 cups all-purpose flour: Provides the structure for the cookies.
• 1/2 teaspoon baking powder: Helps the cookies rise and achieve a light texture.
• 1/4 teaspoon baking soda: Aids in spreading and browning during baking.
• 1/4 teaspoon salt: Enhances the overall flavor of the cookies.
• 1/2 cup unsalted butter, softened: For a rich and creamy base.
• 1 cup granulated sugar: Adds sweetness and a slight crunch to the edges.
• 1 large egg: Binds the ingredients and adds moisture.
• 1 teaspoon vanilla extract: Brings warmth and depth of flavor.
• 1/2 cup fresh blueberries: The star ingredient, providing bursts of fruity flavor.
• 1/2 teaspoon lemon zest: Adds a refreshing, zesty contrast to the sweetness of the blueberries.
• 2 tablespoons purple food coloring (optional): For a vibrant and visually appealing cookie.
• 1 tablespoon coarse sugar for sprinkling: Adds a delightful crunch and sparkle to the top of the cookies.
• For gluten-free: Replace all-purpose flour with a gluten-free baking mix.
• For dairy-free: Use plant-based butter and ensure that the food coloring is vegan-friendly.