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										Preheat oven to 350 degrees. 
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										Line the bottom of an 8x8 square baking pan with parchment paper or foil. Spray edges of pan with non-stick cooking spray. 
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										In a large bowl, whisk together sugar, melted butter, and oil. 
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										Add eggs and vanilla, whisk until smooth. 
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										Add cocoa powder, flour, baking powder, and salt; whisk until smooth. 
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										Stir in chocolate chips. 
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										Pour brownie batter into prepared pan and spread into an even layer. 
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										To make the cheesecake filling, whisk together the cream cheese, egg, and sugar until smooth. 
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										Add dollops of cream cheese mixture and peanut butter over the brownie batter. Swirl with the tip of a knife or with a toothpick. 
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										Bake brownies 27-30 minutes, or until a toothpick is inserted and comes out with only a few moist crumbs. 
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										Cool completely, then slice into 9 large bars or 12 mini bars.