Yields: 9 cookies
Prep Time: 10 minutes
Cook Time: 15 minutes
Total Time: 25 minutes

1 1⁄2 cups all-purpose flour
1⁄4 tsp baking powder
1⁄4 tsp baking soda
1⁄4 tsp salt
1⁄2 cup (1 stick) unsalted butter, softened
3⁄4 cup sugar
1 large egg
1 tsp grated lemon zest
1 tsp vanilla extract
1⁄2 cup sour cream
Sugar, for sprinkling

1. Heat oven to 375 degrees F. Grease 2 large baking sheets. In a small bowl, whisk flour, baking powder, baking soda, and salt.

2. In a bowl, beat butter and sugar 2 minutes. Beat in egg, lemon zest, and vanilla extract until well blended. Beat in sour cream, then flour mixture, until combined.

3. Drop the dough by 1⁄3 cupfuls 3 inches apart onto prepared baking sheets. Sprinkle with sugar. Bake in lower third of oven 15 minutes, or until cookies spring back when pressed lightly. Let stand 3 minutes on baking sheets; cool completely on wire rack.