On The Go Brownies
Ingredients 9 tablespoons unsalted butter, softened, plus more for pan 9 ounces good-quality semisweet chocolate, coarsely chopped 1/3 cup unsweetened Dutch-process cocoa powder 1 cup all-purpose flour 1/2 teaspoon baking powder 1/4 teaspoon salt 1 1/2 cups sugar 3 large eggs 1 tablespoon pure vanilla extract Preparation Preheat oven to 350 degrees. Butter 9-by-13-inch cake pan; line with parchment paper, allowing 2-inch overhang. Butter parchment. Put butter, chocolate, and cocoa in heatproof bowl set over pan of simmering water; stir until butter and chocolate have melted....