Step 1

Preheat the oven to 425 degrees F. Adjust the oven rack to the upper-middle position.

Step 2

Prepare the ramekins. Grease the four ramekins with butter. Add granulated sugar over the butter.

Step 3

Add cornstarch and sugar to the bowl and whisk it well.

Step 4

Add about an inch of water to the saucepan and simmer it. Boil it half. After that, place a heatproof bowl over the top. Add butter and chopped chocolate to the bowl. Heat it until butter and chocolate are melted.

Step 5

Add the chocolate mixture to the sugar mixture. Whisk it well.

Step 6

Next, add the vanilla extract, egg yolks, and eggs. Whisk them again to combine thoroughly.

Step 7

After that, pour the batter into the prepared ramekins. Place on the rimmed baking sheet.

Step 8

Place this rimmed baking sheet in the oven and bake them for 13 to 16 minutes until the top is set.

Step 9

Remove from the oven. Let cool it for two minutes. Run a knife around the edges of ramekins.

Step 10

Invert onto the serving plate carefully.

Step 11

Serve immediately.