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1
Preheat oven to 350u00b0.
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2
To prepare cake, coat 2 (9-inch) round cake pans with cooking spray; line bottoms of pans with wax paper. Lightly coat wax paper with cooking spray; dust pans with 1 tablespoon flour.
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3
Combine cocoa, 1/2 cup boiling water, and 1 ounce bittersweet chocolate in a small bowl, stirring until smooth; cool. Place 3/4 cup granulated sugar, 1/2 cup dark brown sugar, and 1/4 cup butter in a large bowl; beat with a mixer at medium speed 2 minutes or until well blended. Add egg substitute; beat well.
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4
Lightly spoon 2 cups flour into dry measuring cups; level with a knife. Combine flour, baking soda, and salt, stirring well with a whisk. Combine buttermilk, sour cream, and 2 teaspoons vanilla, stirring well. Add flour mixture and buttermilk mixture alternately to sugar mixture, beginning and ending with flour mixture. Stir in cocoa mixture.
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5
Spoon batter into prepared pans. Sharply tap pans once on counter to remove air bubbles. Bake at 350u00b0 for 25 minutes or until a wooden pick inserted in center comes out clean. Cool in pans 10 minutes; remove from pans. Remove wax paper; discard. Cool cakes completely on wire racks.
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6
To prepare filling, place chips in a microwave-safe bowl, and microwave at high for 1 minute, stirring every 15 seconds. Cool slightly. Fold 1/4 cup whipped topping into melted chips. Repeat procedure 7 times with remaining whipped topping. Chill 1 hour.
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7
To prepare ganache, combine 2/3 cup granulated sugar and next 4 ingredients (through 2 ounces bittersweet chocolate) in a medium saucepan over medium heat; bring to a boil. Cook 2 minutes or until sugar dissolves and chocolate melts, stirring constantly. Remove from heat. Stir in 1 teaspoon vanilla; cool completely. Chill 30 minutes or until thick.
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8
Place 1 cake layer on a plate; top with filling, spreading out to edges. Place remaining cake layer on filling. Spread ganache evenly over top of cake; let drip down sides. Chill 20 minutes or until set.
