Preheat your oven to 350°F (175°C). Grease a small springform pan and line the bottom with parchment. Don’t skip this—sticking is not a good look for dessert.
Melt the chocolate and butter together until silky. You want smooth, not a lava pit. Let it cool for a minute so you don’t scramble the eggs.
Whisk eggs, sugar, salt, and vanilla in a separate bowl until the mixture is light and a bit fluffy. It won’t become a meringue, but you’ll see some air in there.
Pour the warm chocolate into the egg mixture slowly, whisking constantly. This step avoids curdling and keeps the texture luxuriously glossy.
Fold in the melted chocolate-butter until just combined. The batter will be thick and velvety—that’s the good stuff.
Pour into the prepared pan. Bake for about 20-25 minutes. You want the center set but still soft—think brownie-lite. If the toothpick comes out with wet batter, give it a few more minutes.
Let it cool in the pan for 15 minutes, then release the ring and invert onto a plate. A slight crack on top is totally chic; it’s character, not failure.