INGREDIENTS
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1 stick (4 oz.) unsalted butter
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7 3 1/2 ounce bars semisweet chocolate12 oz. chopped, 7.5 oz. cut into 1-inch squares and the rest for garnish
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1 1/2 cups flour
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1/4 cup unsweetened cocoa powder
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1 1/2 teaspoons baking powder
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1/4 teaspoon salt
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1 1/4 cups (packed) light brown sugar
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3 eggs, at room temperature
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1 1/2 teaspoons pure vanilla extract
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30 marshmallows