Making Blackberry Pistachio Dream Bars is a rewarding endeavor when you follow these easy steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Line an 8×8 inch baking pan with parchment paper for easy removal.
2. Make the Crust: In a medium bowl, combine flour, sugar, and salt. Stir in melted butter and blend until crumbly.
3. Press the Crust: Press the mixture firmly into the bottom of the prepared baking pan. Bake for 10 minutes or until set.
4. Prepare the Filling: In a larger bowl, whisk together eggs, vanilla extract, milk, and baking powder until smooth.
5. Add Blackberries and Pistachios: Gently fold in the fresh blackberries and chopped pistachios into the egg mixture.
6. Pour Filling: Pour the berry-pistachio mixture over the pre-baked crust, spreading it evenly.
7. Bake: Return the pan to the oven and bake for an additional 25-30 minutes, or until the center is set and a toothpick comes out clean.
8. Cool: Remove from the oven and allow to cool completely in the pan on a wire rack.
9. Cut and Serve: Once cool, lift the bars out using the parchment paper. Cut into squares or rectangles for serving.

These straightforward steps will guide you to create your own batch of Blackberry Pistachio Dream Bars with ease. The combination of flavors and textures in each bite will keep your audience wanting more!