In a large mixing bowl, combine all-purpose flour, eggs, milk, melted butter, sugar, and vanilla extract. Whisk until smooth and cohesive. Allow the batter to rest for 10 minutes.

Preheat a non-stick skillet over medium heat for 2-3 minutes. Lightly grease the skillet. Test readiness with a drop of water; it should sizzle.

Pour 1/4 cup of prepared batter into the skillet, swirling to spread into a thin layer. Cook for 1-2 minutes until edges lift and are golden. Flip and cook for another minute, then transfer to a plate.

On a serving plate, drizzle chocolate sauce in a spiraling pattern on a freshly cooked crepe, then drag lines to create the spiderweb effect.

Top crepes with whipped cream and sprinkle with powdered sugar or Halloween decorations before serving.