Preparation Steps

• Preheat oven to 350°F (175°C). Grease a 9x13-inch baking pan or line with parchment paper.
• In a large bowl, whisk together melted butter and sugar until smooth. Add eggs one at a time, mixing well after each addition. Stir in vanilla.
• In a separate bowl, whisk together flour, baking powder, and salt. Gradually add dry ingredients to wet ingredients, mixing until just combined.
• Pour half of the batter into the prepared pan and spread evenly. Drop spoonfuls of peanut butter over the batter and gently swirl with a knife.
• Pour remaining batter over the peanut butter layer. Drop spoonfuls of jelly on top and swirl through the batter to create a marbled effect.
• Bake for 28–32 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
• Cool completely in the pan before cutting into 16 squares.