– 1 cup butter – 2/3 cup granulated sugar – 2 egg yolks – 1 tsp. vanilla extract – 2 cups all-purpose flour – 1/2 tsp. salt
Using an electric mixer, beat together butter and sugar on medium-high speed until light and fluffy, about 2 to 3 minutes.
Form dough into 1-inch balls, and arrange on prepared cookie sheet. Use a ½ tsp. measuring spoon to create perfectly circular craters in the center.
Bake cookies for 8 to 10 minutes. Remove cookie sheet from oven. If indentations look shallow, further define them again and fill each with about 1/2 tsp of lemon curd.