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For the crust-----------.
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Preheat oven to 350.
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Grease a 9-inch springform pan.
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Dust with flour.
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Melt unsweetened chocolate and butter in small saucepan over low heat.
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Cool.
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Beat eggs and sugar in medium bowl until slowly dissolving ribbon forms when beater are lifted, about 4 minutes.
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Beat in melted chocolate mixture, vanilla, and chopped chocolate.
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Add flour and baking powder.
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Mix until just blended--do not overbeat.
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Spread 1 cup brownie batter over bottom of pan.
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Bake until firm, about 17 minutes.
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Cool baked crust in freezer for about 15 minutes.
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Maintain oven temperature.
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For the filling---------.
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Blend cream cheese and sugar until smooth.
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Add eggs and sour cream.
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Add peanut butter and flour.
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Using small knife, spread remaining brownie batter around the sides of the pan, sealing batter to bottom crust.
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Pour in filling, which will not be as high as brownie batter.
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Bake until center of cheesecake is gently set and brownie sides have fallen to form a ring around the filling.
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(About 50 minutes) For topping---------.
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Blend sour cream and sugar.
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Spread on top of cheesecake to within 3/4 inch of edge.
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Bake cheesecake 3 more minutes.