Cream together the butter and peanut butter, then add the sugar and brown sugar.
Beat in the egg and vanilla.
Mix in the flour, baking soda, and salt until just combined.
Place tablespoon-sized balls of dough on a baking sheet lined with parchment paper. Use a teaspoon to make an indent in the center of the dough balls. Freeze for 30 minutes.
Preheat the oven to 350F.
Place the jam in a bowl and microwave for about 30 seconds or until it is runny and easier to spoon into the cookies.
Fill the indents in the dough balls to the brim with jam and bake for about 12 minutes.
Excellent! Easy to make.
Great combination and not too sweet.