Creating these incredible Pistachio Chocolate Lava Cakes is easy when you follow these steps:

1. Preheat the Oven: Preheat your oven to 425°F (220°C). Grease four ramekins with butter and dust with flour to prevent sticking.
2. Melt Butter and Chocolate: In a microwave-safe bowl, combine the unsalted butter and semi-sweet chocolate chips. Microwave in 30-second intervals, stirring in between, until melted and smooth.
3. Whisk Eggs: In a separate bowl, whisk together the eggs, egg yolks, and granulated sugar until light and frothy.
4. Combine Mixtures: Gradually pour the melted chocolate mixture into the egg mixture while whisking continuously to temper the eggs.
5. Add Dry Ingredients: Gently fold in the flour, vanilla extract, salt, and finely chopped pistachios until just combined. Be careful not to overmix.
6. Fill Ramekins: Divide the batter evenly among the prepared ramekins, filling them about ¾ full.
7. Bake: Place the ramekins on a baking sheet and bake in the preheated oven for 12-15 minutes. The edges should be set, while the center remains soft.
8. Cool Slightly: Once baked, remove the ramekins from the oven and let them cool for about 5 minutes.
9. Invert and Serve: Carefully run a knife around the edges of each ramekin, then invert onto serving plates. Gently lift the ramekins off to reveal the lava cakes.
10. Garnish: Dust with powdered sugar and sprinkle additional chopped pistachios on top for a beautiful finish.

These steps will guide you in creating the perfect Pistachio Chocolate Lava Cakes, ensuring that the molten center is just right!