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1
For crust: Position rack in centre of oven and preheat to 360 degrees F (170C).
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2
Butter a 9 inch diameter springform pan.
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3
Dust pan lightly with flour.
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4
Melt chocolate and butter.
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5
Cool.
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6
Blend flour, salt and baking powder in small bowl.
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7
Beat eggs and sugar in bowl until ribbon forms when beaters are lifted, about 4 minutes.
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8
Scrape down sides of bowl.
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9
Beat in chocolate, vanilla and chopped chocolate.
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10
Add dry ingredients and mix until just blended; do not overbeat.
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11
Spread 1 cup batter over bottom of pan.
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12
Bake until firm, about 17-20 minutes.
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13
Cool crust in freezer, about 15 minutes.
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14
Maintain oven temperature.
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15
Prepare filling: Blend cream cheese and sugar until smooth.
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16
Add eggs and sour cream and beat until smooth.
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17
Blend in peanut butter.
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18
Using small knife, spread remaining brownie batter evenly around sides of pan, sealing to bottom crust.
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19
Pour in filling, which will not be as high as brownie batter.
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20
Bake until centre is gently set and brownie sides have fallen to form a 1 inch wide ring around filling, about 30 minutes.
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21
For topping: Blend sour cream and sugar in small bowl.
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22
Spread evenly over cheesecake to cover (you may or may not add peanut butter to topping).
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23
Bake 3 more minutes.
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24
Set cake on rack.
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25
Using small, sharp knife, cut around top edge of cake to loosen from pan sides.
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26
Cool completely.
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27
Loosen cake with knife and release from pan.
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28
Refrigerate until 1/2 hour before serving time.