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1
Heat oven to 350F.
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2
Spray 2 (9-inch) round pans with cooking spray; dust with cocoa powder.
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3
Coarsely chop 7 cookies; set aside.
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4
Finely crush remaining cookies; place in medium bowl.
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5
Add flour, baking powder and soda; mix well.
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6
Beat egg whites in small bowl with mixer on high speed until stiff peaks form; set aside.
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7
Beat granulated sugar, 1/3 cup butter and egg yolks in large bowl with mixer until well blended.
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8
Add flour mixture, water, sour cream, melted chocolate and 1 tsp.
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9
vanilla; beat on medium speed 1 min.
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10
Gently stir in egg whites until well blended.
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11
Pour into prepared pans.
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12
Bake 25 min.
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13
or until toothpick inserted in centers comes out clean.
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14
Cool in pans 10 min.
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15
Remove from pans to wire racks; cool completely.
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16
Beat 1 cup powdered sugar with remaining butter and vanilla in large bowl with mixer until well blended.
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17
Add remaining powdered sugar alternately with milk, beating well after each addition.
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18
Reserve 1/2 cup frosting.
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19
Stack cake layers on plate, filling with remaining frosting and chopped cookies.
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20
Spread top with Chocolate Glaze.
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21
Let stand 10 min.
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22
Decorate with reserved frosting.
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23
Keep refrigerated.
