Peanut Butter & Jelly Thumbprint Cookies

1
Preheat oven to 300°.
2
In a large bowl, mix sugar and butter.
3
Add vanilla and egg, mixing well.
4
Stir in flour and salt.
5
Drop by rounded teaspoonfuls onto ungreased cookie sheet.
6
Make indent in cookie with finger.
7
First put about 1/4 tsp peanut butter in cookie; top peanut butter with about 1/4 tsp strawberry jam, filling indentation.
8
Bake at 300° for 20-25 minutes or until edges are golden.
9
Remove immediately from cookie sheet and cool on wire rack.