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1
In a bowl cream together 1/2 stick of the butter, the peanut butter, and the brown sugar.
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2
Beat in 1 of the eggs and the cream cheese, a little at a time, beating until the mixture is smooth.
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3
In a small saucepan melt 1 stick of the remaing butter with the chocolate over low heat, stirring until the mixture is smooth, and let the chocolate mixture cool.
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4
In another bowl cream together the remaining 1 stick of butter and the granulated sugar, beating until the mixture is light and fluffy, and beat in the remaining 2 eggs, 1 at a time, beating well after each addition.
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5
Stir in the chocolate, the vanilla, and the flour, sifted, and pour the batter into a buttered 13-by 9-inch baking pan.
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6
Drop dollops of the peanut butter mixture into the batter, swirling to marble the batter.
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7
Bake the brownies in the middle of a preheated 350 degree oven for 45 to 50 minutes, or until they pull away slightly from the sides of the pan and tester comes out with crumbs adhering to it.
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8
Let brownies cool before cutting into squares.
