Creating Key Lime Pie Bars – Browned Butter Blondie is a straightforward process. Follow these steps for delicious results:

1. Preheat the oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper, leaving some overhang for easy removal.
2. Brown the Butter: In a saucepan over medium heat, melt the butter, swirling occasionally until it turns golden brown and has a nutty aroma. Remove from heat and let cool slightly.
3. Mix Brown Sugar and Butter: In a large mixing bowl, combine the browned butter with brown sugar. Mix until well combined.
4. Add Eggs and Vanilla: Add the eggs, one at a time, mixing well after each addition. Stir in the vanilla extract until combined.
5. Combine Dry Ingredients: In another bowl, whisk together the baking powder, salt, and flour till evenly mixed.
6. Add Dry Ingredients to Wet: Gradually add the dry mixture to the wet ingredients, stirring until just combined.
7. Spread in Pan: Pour the blondie batter into the prepared baking pan, spreading evenly.
8. Prepare Key Lime Filling: In a separate bowl, whisk together the sweetened condensed milk, key lime juice, and key lime zest until smooth.
9. Pour Filling Over Batter: Carefully pour the key lime mixture over the blondie batter, spreading it evenly.
10. Bake: Bake in the preheated oven for 25-30 minutes or until the edges are set and the center is slightly jiggly. It will firm up as it cools.
11. Cool: Remove from the oven and allow to cool in the pan for at least 1 hour. Then, lift out the bars using the parchment paper and cool completely on a wire rack.
12. Dust with Powdered Sugar: Before serving, dust the top with powdered sugar for an extra touch of sweetness.

These steps will ensure your Key Lime Pie Bars – Browned Butter Blondie turns out perfectly every time.