1. Part 1: Making the Crêpes

2. 1. In a large bowl, whisk together flour, sugar, and a pinch of salt.

3. 2. In a separate bowl, whisk eggs until frothy. Gradually add milk, melted butter, and vanilla extract; whisk until combined.

4. 3. Pour wet ingredients into dry ingredients; whisk continuously until smooth and lump-free.

5. 4. Cover bowl with plastic wrap and refrigerate batter for at least 30 minutes (up to 1 hour or overnight).

6. 5. Heat an 8-inch non-stick crêpe pan or skillet over medium-low heat. Lightly grease with cooking spray or butter.

7. 6. Pour about ¼ cup batter into the hot pan; immediately tilt and swirl to coat bottom evenly.

8. 7. Cook for 1-2 minutes until edges crisp and turn golden, and surface looks set.

9. 8. Gently loosen edges with a thin spatula, then flip crêpe. Cook for 30 seconds to 1 minute until lightly golden on second side.

10. 9. Slide cooked crêpe onto a plate. Repeat with remaining batter, greasing pan as needed between crêpes.

11. Part 2: Preparing the Chocolate Filling (Ganache)

12. 1. If using a chocolate bar, finely chop it. Place chocolate in a heatproof bowl.

13. 2. In a small saucepan, heat heavy cream, 2 tbsp butter, and a pinch of salt over medium heat until just simmering around edges (do not boil vigorously).

14. 3. Immediately pour hot cream mixture over chocolate. Let sit undisturbed for 5 minutes.

15. 4. Add 1 tsp vanilla extract. Gently stir with a whisk or spatula, starting from center and working outward, until completely smooth and glossy.

16. 5. Let ganache cool at room temperature for 15-20 minutes until spreadable but not too firm.

17. Part 3: Assembling the Rolled Crêpes

18. 1. Place one cooked crêpe flat on a clean surface or plate.

19. 2. Spoon about 1-2 tablespoons cooled ganache onto crêpe; spread evenly over entire surface, leaving a small border around edges.

20. 3. Gently but firmly roll crêpe from one side to the other into a neat cylinder.

21. 4. Repeat with remaining crêpes. Arrange on a serving platter.

22. 5. Dust generously with powdered sugar if desired, and garnish with fresh berries or other toppings. Serve immediately.