Creating these amazing Blackberry Lemon Bars is simple if you follow these steps:

1. Preheat your oven to 350°F (175°C). Grease an 8×8-inch square baking dish or line it with parchment paper for easy removal.
2. Make the crust: In a medium bowl, mix the flour, powdered sugar, and salt. Add the softened butter and mix until crumbly. Press the mixture evenly into the bottom of the prepared dish.
3. Bake the crust: Place in the preheated oven and bake for 15-20 minutes or until lightly golden.
4. Prepare the filling: While the crust is baking, whisk together the eggs and granulated sugar in a separate bowl until well combined.
5. Add lemon: Stir in the fresh lemon juice, lemon zest, and baking powder until smooth.
6. Add blackberries: Gently fold the blackberries into the lemon mixture, being careful not to crush them.
7. Combine filling and crust: Once the crust is done baking, pour the lemon and blackberry filling on top of the hot crust.
8. Bake again: Return to the oven and bake for an additional 25-30 minutes or until the filling is set and the edges are lightly browned.
9. Cool down: Remove from the oven and let it cool in the baking dish. Once cooled, transfer to the refrigerator for about 20-30 minutes to chill.
10. Serve: Dust the top with additional powdered sugar if desired, and cut into squares for serving.

These easy steps will guide you in creating stunning Blackberry Lemon Bars that are both delicious and memorable.