Preparation Steps

• Preheat the oven to 350°F (175°C). Line an 8x8 inch baking pan with parchment paper and grease lightly.
• Melt the butter in a saucepan over low heat and let it cool slightly.
• In a large bowl, whisk together the brown sugar and melted butter until smooth.
• Add eggs one at a time, beating well after each addition. Stir in the vanilla extract.
• In a separate bowl, whisk together the flour, baking powder, and salt.
• Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
• Pour half of the batter into the prepared pan. Drop half of the Nutella by spoonfuls over the batter and swirl gently with a knife. Repeat with remaining batter and Nutella.
• Bake for 25 minutes or until the edges are golden and a toothpick inserted in the center comes out clean.
• Cool completely before cutting into squares and serving.