Making a chocolate soufflé might seem intimidating at first, but by following these detailed steps, you can achieve a perfect rise and a molten center:

Step 1: Prepare the Oven and Ramekins

1. Preheat your oven to 375°F (190°C).
2. Grease four ramekins (6-ounce size) with butter. Ensure they are thoroughly coated to help the soufflé rise smoothly.
3. Dust the inside of the ramekins with sugar, tapping out any excess. This creates a crust that helps the soufflé climb as it bakes.

Step 2: Melt the Chocolate

4. Chop the dark chocolate into small pieces for even melting.
5. In a heatproof bowl, melt the chocolate and butter together over a pot of simmering water (double boiler method). Stir until smooth, then remove from heat and set aside to cool slightly.

Step 3: Prepare the Egg Mixture

6. Separate the eggs, placing the yolks in one bowl and the whites in another.
7. Add the flour, vanilla extract, and a pinch of salt to the egg yolks. Mix until well combined.
8. Fold the cooled chocolate mixture into the egg yolk mixture until smooth.

Step 4: Beat the Egg Whites

9. Using an electric mixer, beat the egg whites until soft peaks form.
10. Gradually add the granulated sugar while continuing to beat until the whites form stiff, glossy peaks.

Step 5: Combine and Bake

11. Gently fold a third of the whipped egg whites into the chocolate mixture to lighten it. Be careful not to deflate the mixture.
12. Fold in the remaining egg whites until fully incorporated, ensuring the mixture is light and airy.
13. Divide the mixture evenly among the prepared ramekins.
14. Place the ramekins on a baking tray and bake for about 12-15 minutes until the soufflés have risen and have a slight wobble in the center.