7 ounces (200 grams) bittersweet chocolate (70 or 72%), roughly chopped

7 ounces (200 grams or 14 tablespoons) unsalted butter, cut into chunks

1 cup (200 grams) granulated sugar

1/4 teaspoon fine sea salt

4 large eggs

2 tablespoons plus 1 teaspoon (20 grams) all-purpose flour

Place chocolate and butter in a large heatproof bowl. Either over a saucepan of simmering water or in the microwave in 15- to 30-second bursts, stirring frequently, melt the two together. Off the heat, whisk in sugar, which should cool the mixture down significantly. Whisk in salt, then eggs, one at a time. Stir in flour.

Cover bowl with plastic wrap and let sit at room temperature for 30 minutes. The batter will thicken a bit as it stands.

Heat oven to 325°F (165°C).

Using an 8x8 or 9x9 pan will require 30-40 minutes at 325 in the middle rack, I line my pan in parchment paper for easy release, use toothpic test to check for doneness

Either coat a 12-cup muffin tin with nonstick spray or line it with cupcake papers. Spoon batter halfway into each cup and bake for 25 to 30 minutes (20 minutes in the mini-tart pans I show), or until a toothpick inserted into the center of cakelets comes out batter-free. (Fudgy crumbs are to be expected.)

Let cool on a rack for 5 to 10 minutes before unmolding. Puffed tops will fall a little as they cool.