Preheat oven to 350
melt some butter. Brush the insides of your ramekins with butter. refrigerate for a few minutes. Then Brush again. This gives a solid coating. return to the fridge. But, keep more melted butter ready for the last coating.
Heat cream in a heavy pot. Stir in the cornstarch and bring to a simmer, stirring frequently. This will result in a thickened cream. You can substitute milk or a lighter cream if you want a lighter souffle. Add the Frangelico and vanilla, and remove from the heat.
Break up the chocolate into small pieces. Pour the hot cream into the chocolate and stir until smooth.
Separate your egg whites and yolks. Stir three yolks into the chocolate mix. Set aside.
Whip the egg whites until white and fluffy. Add the sugar and continue whipping to a point where they will hold stiff peaks. But, don't over-whip or they will separate into a foam and liquid.
carefully fold the chocolate, a little at a time, into the egg whites. Do not whip or stir. You want to keep the whites light and airy.
Remove ramekins from the fridge. Brush once more with butter, then pour in some sugar, turn the ramekins to coat with sugar. Shake out the extra sugar.
Fill the ramekins and place them on a sheet pan. Bake at 350 for about 20 minutes. If you have to check on them, try looking through the window. They should rise about an inch over the ramekin edge. Baking time depends on the size of your ramekins. it takes about 20 to 25 minutes for a 4 to 6 ounce vessel. Longer for a larger one.
Remove from oven, sprinkle with powdered sugar. Serve with a berry coulis or other sauce if desired. Serve as soon as possible before they deflate.