Prep time: 15 minutes Cook time: 9-11 minutes per batch Materials: 2 3/4 cup flour 1 tsp baking soda 1tsp cream of tartar Pinch of salt 1 cup unsalted butter softened at room temperature 1 cup sugar (plus additional 1/4 cup for dipping) 2 large eggs at room temperature 1 tbsp. vanilla extract 1 tbsp….