Preheat oven to 450 degrees. Using 1 tsp. of butter, grease and dust four 4 or 6 ounce ramekins with cocoa powder. Tap out the excess cocoa powder; set aside.
In a medium microwave-safe bowl, add 1/2 cup butter. Place in the microwave and melt. Whisk in the chopped chocolate until smooth.
In a separate medium mixing bowl add the eggs. Add the vanilla (if desired) and sugar, whisk until slightly thickened, about 1 minute. Add the egg mixture and flour to the melted chocolate; beat until combined.
Divide the batter between the ramekins. Place in the oven and bake for 8 to 9 minutes. The tops should look set but still be jiggly. Remove from the oven and allow to cool for 1 minute before inverting onto plates. Let the cakes sit for 10 seconds before lifting up the ramekins. Serve immediately, with ice cream, chocolate sauce and fresh fruit.
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Notes
- You can add a dab of peanut butter, cookie butter or Nutella into the middle of these for an even more decadent lava cake!