Chocolate Brownie Hearts

6 oz bittersweet chocolate, finely chopped
6 tbsp (1.5 oz) unsalted butter, cut into small pieces
1/2 cup all-purpose flour
1/2 tsp baking powder
pinch salt
2/3 cup granulated sugar
2 large eggs
1 tsp vanilla extract

Preheat an oven to 325ºF.
Melt the chocolate and butter over a double boiler, stirring occasionally, until smooth and blended. Let cool slightly.
Sift together the flour, baking powder and salt. Set aside dry ingredients.
In another bowl, whisk together the sugar, egg and vanilla until light in color and doubled in volume. Whisk in the chocolate mixture and then the flour mixture just until combined.
Bake until a toothpick inserted into the center of a brownie comes out with a few moist crumbs attached, about 20 minutes.