Preheat the oven to 450°F (see note)
Prep the ramekins: You'll need 4, 6 oz. ramekins. Grease each ramekin by spreading a thin layer of softened butter in each ramekin. Then add in some cocoa powder, twirl and tap it around so it coats the sides and bottoms and then gently tap out any excess cocoa powder. You may also use flour, either or will help to release the cake from the ramekin. Place the ramekins on a parchment paper lined baking sheet and set aside.
2 Tbsp. softened butter, 1-2 Tbsp. cocoa powder
Melt the chocolate and butter in the microwave in 20-30 second intervals until smooth, stirring in between. Add the espresso powder and stir until silky. Set aside.
8 Tbsp. butter, unsalted, 1/2 tsp. espresso powder, 8 oz. chocolate, roughly chopped (I use Ghirardelli)
Beat the egg mixture: In a stand mixer fitted with the whisk attachment, beat the eggs, egg yolks, sugar, vanilla, and salt at high speed until light and fluffy, about 3-4 minutes.
2-3 eggs*, room temperature, 2-3 egg yolks*, room temperature, 1/2 cup confectioners sugar or granulated sugar, 1 tsp. vanilla extract, 1/2 tsp. salt
Stir in chocolate: Gently stir in the chocolate mixture into the egg mixture. It will look very fluffy still at this point.
Fold in flour: Sprinkle the flour on top and fold in the flour using a rubber spatula until no more flour pockets remain but do not overmix. The batter will thicken as the flour hydrates it.
1/4 cup all purpose flour
Bake: Divide into the prepared ramekins. I like to use a cookie scoop to make this easier. Bake ~9-13 minutes or until the edges are firm and the center is slightly soft. Every oven is a little different, but it should be set, not wet to the touch, and the center will have a slight jiggle. Feel free to bake longer if needed, just be careful because we still want that lava center!
Cool: Let the cakes cool in the ramekins for about 2 minutes. Then run a butter knife around the edges to loosen them, and invert the cakes onto serving plates. (the longer you keep the molten cake in the ramekins, the less ooey-gooey the centers
Serve: Dust with powdered sugar, and serve immediately with fresh berries and ice cream and enjoy!
garnish: powdered sugar, berries, whipped cream, ice cream, chocolate sauce, cocoa powder