I always double the batch due to the recipe only making about 12 cookies.
1/2 cup of butter
1/4 cup of sugar
1 egg separated, reserving egg white
1/2 tsp vanilla
1 cup flour
1/8 tsp salt
Preheat oven to 350 degrees and place parchment paper on a cookie sheet.
In mixing bowl add butter and sugar, cream together. Add egg yolk and vanilla mixing until combined. Add flour and salt and mix until dough forms.
Roll into 1 inch balls dip in egg white and place on baking sheet about 1 inch apart. With thumb put a small indent in the middle of cookie balls pushing down. Place 1 tsp jelly (I used red raspberry) and bake for 12-15 minutes. Let cool completely on rack.
This is a recipe that I got from my mom, she has been making them for 30 plus years!! I’m not sure of where the recipe originally came from!!:)