Ingredients:
- Nonstick vegetable oil spray
- 12 ounces bittersweet chocolate (do not exceed 61% cacao), chopped, divided
- 11 tablespoons (1 stick plus 3 tablespoons) unsalted butter, cut into 1-inch cubes
- 1 1/4 cups sugar
- 3 large eggs
- 1 1/2 teaspoons vanilla extract
- 1/4 teaspoon salt
- 1 cup unbleached all purpose flour
- 1 cup walnuts, toasted, coarsely chopped
- 3/4 cup heavy whipping cream