Step 1: Prepare Ramekins and Preheat Oven
Position your oven rack in the lower third of the oven and preheat to 400°F (200°C). Using a pastry brush, generously butter six 6-ounce ramekins, brushing upward from the bottom in vertical strokes—this helps the soufflés climb straight up the sides. Coat the buttered ramekins with granulated sugar, tapping out any excess. Place the prepared ramekins on a baking sheet and set aside. This preparation is crucial for proper rising!

Step 2: Make the Chocolate Base
In a medium saucepan over low heat, combine the chopped chocolate, butter, and milk (or cream). Stir constantly with a whisk until completely melted and smooth, about 3-4 minutes. Remove from heat. Sift the flour and cocoa powder directly into the chocolate mixture, whisking constantly to prevent lumps. The mixture will thicken slightly—this is perfect.

Step 3: Add Egg Yolks and Sugar
In a small bowl, whisk together the egg yolks and ¼ cup sugar until slightly lightened in color. Gradually whisk about ⅓ of the warm chocolate mixture into the yolks (this tempers them so they don’t scramble). Then pour the yolk mixture back into the saucepan with the remaining chocolate, whisking constantly. Stir in the vanilla and salt. Transfer this chocolate base to a large mixing bowl and let it cool slightly while you prepare the egg whites. It should be warm but not hot.

Step 4: Whip the Egg Whites
This is the crucial step! In a completely clean, dry metal or glass bowl, add the egg whites and cream of tartar. Using a stand mixer or hand mixer, beat on medium speed until foamy, about 1 minute. Add a pinch of salt. Gradually add the ¼ cup sugar, about 1 tablespoon at a time, beating continuously. Increase speed to medium-high and continue beating until the egg whites form stiff, glossy peaks—when you lift the beaters, the peaks should stand straight up without drooping. This takes about 4-5 minutes total. Don’t underbeat (too soft) or overbeat (dry and grainy).

Step 5: Fold the Mixtures Together
This folding technique is key to maintaining the airiness! Using a rubber spatula, stir about ¼ of the whipped egg whites into the chocolate base to lighten it. Then gently fold in the remaining egg whites in two additions. Use a folding motion: cut down through the center of the mixture, sweep along the bottom, and bring the spatula up the side, turning the bowl as you go. Fold just until no white streaks remain—some small white flecks are fine. Don’t overmix or you’ll deflate the air bubbles!

Step 6: Fill the Ramekins
Divide the soufflé mixture evenly among the prepared ramekins, filling them about ¾ full (they’ll rise above the rim as they bake). Use a spoon or small ladle for even distribution. Once filled, run your thumb or an offset spatula around the inside rim of each ramekin to create a small groove—this helps the soufflé rise straight up with that classic “top hat” appearance.

Step 7: Bake Immediately
Place the baking sheet with ramekins in the preheated oven right away (soufflés can’t wait!). Bake for 12-15 minutes without opening the oven door. The soufflés are done when they’ve risen about 2 inches above the ramekin, the tops are set and slightly crispy, and they jiggle just slightly in the center when gently shaken. Smaller soufflés may take 12 minutes; larger ones closer to 15 minutes.

Step 8: Serve Immediately
Soufflés begin deflating as soon as they come out of the oven, so serve them immediately! Dust with powdered sugar, place on serving plates, and bring to the table right away. Instruct your guests to break into the center with a spoon to reveal the creamy, molten interior. Some people like to pour a little cream into the center—delicious!