01 - Preheat oven to 350°F and line baking sheet with parchment paper
02 - Beat softened butter and granulated sugar in large bowl until light and fluffy
03 - Mix in egg yolk and vanilla extract until fully incorporated
04 - Gradually blend in flour and salt until dough just comes together
05 - Roll dough into 1-inch balls and place 2 inches apart on prepared baking sheet
06 - Press thumb or spoon back gently into center of each ball to form well
07 - Spoon approximately 1/2 teaspoon lemon curd into each indentation
08 - Bake 10 to 12 minutes until edges begin turning golden brown
09 - Let rest on baking sheet 5 minutes then transfer to wire rack; dust with powdered sugar once cooled