Molten Chocolate Cakes

NOTE: It’s really important to use good quality chocolate. The flavor will suffer greatly if you don’t. I have used Ghirardelli 60% bittersweet baking bars, Trader Joe’s bittersweet pound-plus, and, when feeling especially indulgent, Green & Black’s 70% dark chocolate bars.
6 ounces 60-70% bittersweet chocolate, coarsely chopped
8 tablespoons (1/2 cup) unsalted butter, cut into cubes
3 large eggs
1/4 cup brown sugar
1/2 teaspoon vanilla extract
pinch of salt
1 1/2 tablespoons unbleached, all purpose flour
1. Preheat oven to 400 degrees. Butter four ramekins or custard cups and dust with flour.
2. Combine chocolate and butter in a heat-proof bowl. Heat over simmering water, stirring until chocolate is melted. (Or heat in microwave and stir every 30 seconds.)
3. In a mixing bowl, combine eggs and sugar. Beat until thick and pale (about 4 to 5 minutes with the whisk attachment on a stand mixer). Add vanilla, chocolate mixture, and salt. Beat until combined. Sprinkle flour on top and fold in.
4. Divide batter evenly among prepared cups. (Optional: place cups on a rimmed baking sheet.) Bake on the lower shelf of the oven, 8-10 minutes (edges will appear baked, quarter-sized middle will be somewhat glossy). Remove from oven to cooling rack.
5. Loosen edges of cakes with a small, flat metal spatula and un-mold onto individual plates. Serve with whipped cream & sprinkle with cinnamon.