Follow these simple steps to create your own Lava Cake:

1. Preheat Oven: Preheat your oven to 425°F (220°C). Grease four ramekins with butter and dust with cocoa powder.
2. Melt Butter and Chocolate: In a microwave-safe bowl, combine the butter and semi-sweet chocolate chips. Microwave in 30-second intervals, stirring until melted and smooth.
3. Mix Eggs and Sugar: In a separate bowl, whisk together the eggs, egg yolks, and granulated sugar until thick and pale.
4. Combine Mixtures: Pour the melted chocolate mixture into the egg mixture and stir until well combined.
5. Add Flour and Salt: Gently fold in the flour and salt until just combined. Be careful not to overmix.
6. Pour Batter: Divide the batter evenly among the prepared ramekins.
7. Bake: Place the ramekins on a baking sheet and bake for 12-15 minutes, or until the edges are firm but the center is soft.
8. Cool Slightly: Remove from the oven and let the cakes cool in the ramekins for about 5 minutes.
9. Invert and Serve: Carefully run a knife around the edges, invert onto plates, and gently lift off the ramekins. Dust with powdered sugar if desired.

These steps will guide you to create the perfect lava cake that oozes chocolate goodness.