INGREDIENTS
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Brownie batter
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1 stick (1/2 cup or 4 ounces) unsalted butter, cut into pieces
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3 ounces unsweetened chocolate, chopped
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1 cup sugar
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2 large eggs
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1/2 teaspoon pure vanilla extract
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2/3 cup all-purpose flour
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Cheesecake batter
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8 ounces cream cheese, well softened
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1/3 cup sugar
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1 large egg yolk
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1/4 teaspoon pure vanilla extract
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1/2 cup semisweet chocolate chips