INGREDIENTS
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•Cooking Spray
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•1 1/4 cups flour
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•1/4 cup unsweetened cocoa powder
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•3/4 teaspoon baking powder
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•1/2 teaspoon salt
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•1/2 cup unsalted butter, cut into pieces
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•8oz bittersweet chocolate
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•1 cup sugar
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•3 large eggs, lightly beaten
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•2 teaspoons vanilla extract
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•1 cup chopped walnuts (optional)