01 - Preheat oven to 350°F and line baking sheets with parchment paper.
02 - For each cookie variety, cream the butter and sugar together in a large bowl until light and fluffy.
03 - Add eggs (if required), flavorings, and mix until combined.
04 - In a separate bowl, whisk together the dry ingredients for each recipe. Gradually add to the wet ingredients, mixing until a soft dough forms.
05 - For drop cookies (lemon and strawberry), scoop tablespoonfuls onto prepared trays, spacing 2 inches apart. For shortbread, roll dough into a log, chill for 30 minutes, then slice into rounds.
06 - Bake each batch for 10-12 minutes, or until edges are lightly golden.
07 - Cool on baking sheets for 5 minutes, then transfer to a wire rack to cool completely.
08 - Store in an airtight container for up to one week.