Creating delightful Blackberry Pistachio Bars is effortless when you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and line an 8×8 inch baking pan with parchment paper, allowing excess paper to hang over the sides for easy removal later.

2. Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking powder, granulated sugar, brown sugar, and salt until combined.

3. Cream Butter: In a large mixing bowl, beat the softened butter until creamy.

4. Add Eggs and Vanilla: Beat in the eggs, one at a time, mixing well after each addition. Then add the vanilla extract and combine until smooth.

5. Combine Dry and Wet Mixtures: Gradually add the dry ingredient mixture to the wet ingredients, stirring until just combined. Take care not to overmix.

6. Fold in Blackberries and Pistachios: Gently fold in the fresh blackberries and chopped pistachios into the batter.

7. Pour into Baking Pan: Pour the batter into the prepared baking pan, spreading it evenly to ensure it bakes uniformly.

8. Bake: Place the pan in the preheated oven and bake for 30-35 minutes or until golden brown and a toothpick inserted in the center comes out clean.

9. Cool: Once baked, remove the pan from the oven and allow it to cool in the pan for about 15-20 minutes.

10. Slice and Serve: Once cooled, use the parchment overhang to lift the bars out of the pan. Cut into squares and dust with powdered sugar if desired before serving.

These steps will guide you in crafting these incredible Blackberry Pistachio Bars with ease.