Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper.

Cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.

Blend in the creamy peanut butter, egg, and vanilla extract until smooth.

In another bowl, whisk together the flour, baking soda, and kosher salt, then mix into the wet ingredients until just combined.

Form dough into 1.5-inch balls, place on baking sheets, and flatten slightly with a fork. Fill centers with jam.

Bake for 13-15 minutes until edges are golden. Cool on the sheet for 5-10 minutes before transferring to a wire rack.