Preheat the oven to 350 degrees. Spray a 9x5-inch loaf pan with cooking spray. Line with a strip of parchment paper so that it overhangs the wide sides of the pan. Spray lightly with cooking spray.
Whisk together the Sunbutter, milk, and vanilla until smooth and well blended. Add the flour, sugar, baking powder, and salt and whisk well.
Pour half the batter into the prepared pan. Spread the jam on top then cover with the rest of the batter. Bake for 40 minutes or until a toothpick inserted into the loaf comes out clean. Let cool in the pan for 1 hour.