For the Cookies – 2 Sticks Unsalted Butter, Room Temperature (8oz or 1 Cup) – 2½ Cups All Purpose Flour – 1 Cup Granulated Sugar – ½ Tablespoon Vanilla Extract – 1 Egg – 1 Egg Yolk – 1 Tablespoon Light Brown Sugar – 1 Teaspoon Baking Soda – ½ Teaspoon Baking Powder – ½ Teaspoon Salt – 3 Tablespoons Lemon Extract – 1 Tablespoon Lemon Zest