Creating these delightful Chewy Caramel Blondie Squares is a straightforward process. Follow these step-by-step instructions to ensure your blondies turn out perfectly:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking pan and line it with parchment paper, leaving some overhang for easy removal.
2. Melt the Butter: In a microwave-safe bowl or using a saucepan, melt the butter and allow it to cool slightly.
3. Mix the Wet Ingredients: In a large mixing bowl, combine the melted butter and brown sugar. Whisk until well combined. Add the eggs and vanilla extract, and continue to whisk until the mixture is smooth.
4. Combine Dry Ingredients: In another bowl, whisk together the all-purpose flour, baking powder, and salt.
5. Incorporate Dry Ingredients: Gradually add the dry ingredients to the wet mixture, stirring gently with a spatula until just combined. Be careful not to overmix, as this can lead to dense blondies.
6. Fold in Caramel and Mix-Ins: Gently fold in the caramel chunks, white chocolate chips, and nuts (if using) until evenly distributed throughout the batter.
7. Pour Batter into Pan: Spread the batter evenly into the prepared baking pan, smoothing the top with a spatula.
8. Bake: Place the pan in the preheated oven and bake for 25-30 minutes, or until the edges are set and a toothpick inserted into the center comes out with a few moist crumbs.
9. Cool and Cut: Allow the blondies to cool completely in the pan on a wire rack. Once cooled, lift them out of the pan using the parchment paper overhang. Cut into squares and serve.