Sugar Cookie Ingredients ½ cup Unsalted Butter, room temperature 1 cup Sugar 1 Egg, large 1 Egg Yolk, large 2 tsp. Vanilla Extract 1 ½ cups Flour 2 tsp. Cornstarch ½ tsp. Baking Powder ½ tsp. Salt Frosting Ingredients ¾ cup Unsalted Butter, room temperature 2 cups Powdered Sugar 2 Tbsp. Heavy Cream 1 ½... Continue Reading →