If using frozen blueberries, coat them lightly with a couple of teaspoons of flour to absorb the excess moisture. Zest is best: The lemon zest is where the fresh lemon flavor resides. Make sure you ...

and can turn the cookie batter blue. Fresh blueberries will give you the best results, but if using frozen or canned, drain them well and fold them into the batter gently. Here's what you need to make ...