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1
Preheat oven to 350F Coat an 8-in springform pan with nonstick baking spray.
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2
Take bottom insert of pan and trace on parchment paper.
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3
Cut out curricular outline and lay marked side down on pan insert.
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4
Lock pan sides into place.
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5
Wrap outside of springform pan with a few layers of oven-safe plastic wrap, then foil (taking care to make sure no plastic wrap is exposed) to form a water proof barrier for cake.
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6
Have ready a roasting pan larger than the springform pan.
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7
Crust: Put crumbs in a small bowl and stir in melted butter until combined.
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8
Press crumb mixture firmly in bottom of pan and up sides.
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9
Bake 8 - 10 minutes until set.
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10
Cool on rack.
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11
Reduce oven to 300F.
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12
Filling: Beat cream cheese, sugar, and cornstarch in a large bowl with mixer on med speed until smooth, scraping sides and bottom of bowl several times with rubber spatula.
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13
Beat in eggs, 1 at a time, just until blended.
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14
Then beat in sour cream and vanilla to combine.
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15
Divide batter evenly between 3 med bowls.
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16
Stir melted milk chocolate into 1 bowl; pour into crust in an even layer.
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17
Whisk pumpkin puree and pumpkin pie spice into another bowl.
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18
Carefully spoon over chocolate layer to cover, then gently smooth into an even layer with an offset spatula (take care batter doesn't run together).
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19
Stir semisweet chocolate into remaining batter.
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20
Carefully spoon over pumpkin layer; spread carefully as above.
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21
Set springform pan in center of roasting pan.
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22
Place roasting pan in oven center rack and add boiling water to come halfway up sides of springform pan.
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23
Bake 1 1/2 hours to 1 3/4 hour until set, but center still jiggles slightly when shaken.
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24
Turn off oven (leave door closed); let cake cool in oven 1 hour (if cake has not pulled away from sides of pan, carefully run a knife that has been dipped in warm water around edge of pan to release cake).
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25
Remove foil and plastic wrap.
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26
Cool cake in pan on wire rack.
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27
Cover; refrigerate at least 4 hours or overnight.
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28
Chocolate Glaze: Stir ingredients in a small saucepan over low heat until chocolate melts and mixture is smooth.
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29
Remove from heat; cool slightly.
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30
Remove pan sides, carefully slide flat spatula or knife between parchment paper and and pan bottom, gently slide cake on serving plate, and dig in!