Preheat oven to 350°F. As preparation, extract the juice and zest from the lemon.
Using a stand mixer or a rubber spatula, lightly beat the softened butter until there are no lumps. Add the granulated and brown sugar. Whip the mixture until light and fluffy.
Add the eggs, lemon zest, and lemon juice. Add optional yellow food dye. Mix to combine.
Add the dry ingredients and mix on medium-low speed until the dough comes together. Transfer it to the refrigerator to chill for about 20 minutes.
Scoop dough balls onto a parchment-lined sheet tray, about 2 tbsp of dough for each. Roll them with your hands to create a perfect sphere.
Take the fresh or frozen blueberries (if using frozen, don’t remove them from the freezer until this point) and gently press some blueberries onto the top of the cookie dough balls. Do not flatten the cookie dough balls, As they will spread well on their own.
Bake the cookies for 12 to 14 minutes or until the center turns from shiny to matte and the edges are golden brown. Allow them to set before transferring them to a cooling rack.
Enjoy the lemon blueberry cookies as is, or make a simple glaze with powdered sugar and water or milk. Use ½ cup powdered sugar and add ½ tbsp of liquid until it reaches the desired consistency. You can also use extra lemon juice if you have some!