Ingredients

• 1 1/2 pounds good-quality bittersweet chocolate, chopped
• 1 cup plus 2 tablespoons (2 1/4 sticks) unsalted butter
• 6 large eggs
• 3/4 cup granulated sugar
• 1 cup plus 2 tablespoons (packed) dark brown sugar
• 1 1/2 teaspoons vanilla extract
• 1 1/2 cups all-purpose flour
• 1/4 teaspoon baking soda
• 1/2 teaspoon cinnamon
• Nonstick cooking spray or 1 tablespoon unsalted butter, to grease the pan

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Instructions

1. Preheat the oven to 350 degrees F.
2. In a medium saucepan over medium-low heat, melt the chocolate with the butter, stirring occasionally. Set aside.
3. In a large bowl, whisk together the eggs and both sugars. Stir in the melted chocolate and butter. Stir in the vanilla.
4. In a separate bowl, combine the flour, baking soda, and cinnamon. Stir the flour mixture into the chocolate mixture until well combined.
5. Grease a 13 by 9-inch pan with nonstick cooking spray or the tablespoon of butter. Pour the batter into the pan and bake for 30 to 40 minutes, until a toothpick comes out clean. Let the brownies cool to room temperature before cutting into 3-inch squares.