Preheat oven to 325℉. Gather the ingredients and place on a counter or table so you have everything close by. Line two baking sheets with Parchment Paper or silicone baking pads.
In a large mixing bowl, cream together the softened butter and powdered sugar. Add vanilla extract.
Combine flour and salt in a small bowl and sift until mixed well. Add to butter mixture and mix thoroughly.
Using a cookie scoop or spoon, form dough into 1-inch balls. Place on prepare baking sheets. Press down with your thumb or a spoon in the center of each cookie. Fill centers with 2 teaspoons of preserves.
Bake in preheated oven for 15-20 minutes until bottoms are just golden brown. Cool on wire racks. When cool, dust with powdered sugar. Makes 2 dozen.
Notes
*Unless otherwise indicated, all of my recipes use salted butter. **You may use Lemon Curd for the filling instead of jam. Simply add 1-2 tablespoons of lemon curd in the cookie hole. Bake as directed and when cookies have cooled, drizzle with lemon icing: 1 cup powdered sugar + 2 tablespoons lemon juice. Allow icing to set and serve. See my Lemon Curd Recipe Here.