There’s a secret ingredient that makes these bars extra tender.

You may worry about the taste of mayonnaise coming through, but don’t.

The hint of vinegar highlights the peanut butter and banana flavors and then vanishes into the background.

Southern Living Peanut Butter Banana Blondies

Credit:Greg DuPree, Food Stylist: Emily Nabors Hall, Prop Stylist: Christine Keely

Whisk together flour, baking powder, and kosher salt in a medium bowl.

Add flour mixture to egg mixture, and stir until just combined.

Fold in 3 tablespoons of the peanuts.

Pour batter into prepared pan, spreading evenly to edges.

Top with remaining 1 tablespoon peanuts.

Place pan on a wire rack, and sprinkle top with flaky sea salt.

Let cool completely, about 2 hours.

Remove from pan using parchment overhang, and transfer to a cutting board.

Cut into 12 pieces; serve.