Place the softened butter and sugar in a bowl and mix together for a few minutes.
Add the flour. Continue to mix.
Then add the vanilla. The mixture will start to come together to form a soft dough.
Remove the dough using a scraper as necessary to a wooden board sprinkled with flour.
Shape into a ball and cover with plastic wrap
Refrigerate the dough until it is somewhat firm. If it is too soft the dough will stick to the utensil you are using to try to create the depression.
Break the dough into pieces and roll into balls about one inch.
Place on a cookie sheet line with parchment paper.
Use the back of a quarter spoon measure to make a depression in each ball. Do this to all the balls of dough.
Then scoop a little jam into a small bowl and using the same quarter teaspoon measure, fill the depression with 1/8 to 1/4 teaspoon of jam.
Bake at 300F for 13-15 minutes.