3tablespoonsunsalted buttersoftened, additional for prepping ramekins
3tablespoonsgranulated sugaradditional for prepping ramekins
1teaspoonvanilla extract
1teaspoonespresso powder
¼teaspooncream of tartaroptional
pinchsalt
1tablespoonpowdered sugarfor dusting
Instructions
Preheat the over to 400°F, 200°C, or gas mark 6. Using the pastry brush liberally brush the insides of the ramekins with extra butter and then coat all of the butter with the extra sugar and set aside.
Add an inch of water to the saucepan and bring to a boil. Place the heatproof bowl on top with the butter and chocolate and gently melt them. Do not allow the bowl to touch the water or any water to get inside the bowl. Once the butter and chocolate have been melted remove the bowl from the pan and set aside to cool.
While the chocolate is cooling add the egg whites to the bowl of a stand mixer fitter with a paddle attachment. Beat the egg whites until foamy and then add the sugar and if you are using the cream of tartar. Beat on high until stiff peaks form. The egg whites should still be shiny.
Add the eggs, vanilla, salt, and espresso powder to the cooled chocolate and whisk to combine and make sure everything is nice and smooth.
Add ⅓ of the egg whites to the chocolate mixture and gently fold them in. Once nicely mixed then add the remaining the egg whites and gently fold to combine. You want to keep as much of the air in the whites as possible.
Place in the refrigerator for 10-15 minutes.
Evenly divide the souffle batter between the 4 ramekins and gently smooth the tops. Bake for 9-11 minutes. You want to wait until the 9 minute mark to check as you don't want to open and close the oven often as it will cause the souffles to fall.