Creating Lemon Raspberry Bars is straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking pan or line it with parchment paper for easy removal.
2. Make the Crust: In a mixing bowl, cream together the softened butter and ½ cup of sugar until light and fluffy. Add flour and salt, mixing until combined.
3. Press the Crust: Press the crust mixture evenly into the bottom of the prepared baking pan. Bake for 15-20 minutes, or until lightly golden.
4. Prepare the Raspberry Swirl: In a small saucepan, combine raspberries, 2 tablespoons of sugar, and 1 tablespoon of lemon juice. Cook over medium heat until the raspberries break down and the mixture thickens slightly, about 5 minutes. Set aside to cool.
5. Make the Lemon Filling: In a large bowl, whisk together the eggs and 1 ½ cups of sugar until well combined. Add fresh lemon juice, baking powder, and lemon zest. Mix until smooth.
6. Combine Layers: Pour the lemon filling over the baked crust. Then, spoon the raspberry mixture over the top, using a knife or toothpick to create swirls.
7. Bake Again: Return the pan to the oven and bake for an additional 25-30 minutes, or until the filling is set and the edges are lightly browned.
8. Cool Completely: Remove from the oven and let the bars cool in the pan on a wire rack. Once cooled, refrigerate for at least one hour to firm up.
9. Slice and Serve: Use a sharp knife to cut the bars into squares. Dust with powdered sugar before serving, if desired.

These simple steps will guide you in creating these incredible Lemon Raspberry Bars effortlessly.