Beat together the butter and Peanut Butter until fluffy.
Add 1/4 cup granulated sugar and the brown sugar and beat until smooth.
Beat in the egg and vanilla.
Combine the flour, baking soda and salt and sift into the peanut butter mixture. Mix until uniform and smooth.
Pull pieces of dough and roll between your hands to form 1-inch balls.
Place cookie balls on a greased cookie sheet 2 inches apart. Make an indentation on each ball with your thumb or spoon, fill the indentation with approximately 1/4 teaspoon Strawberry Jam. Bake for 12-15 minutes until golden brown on the edges. Cool on wire rack.