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Cake: In bowl, cream butter with sugar until fluffy.
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Beat in eggs, one at.
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a time, then vanilla.
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Beat in sour cream.
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Combine flour, baking soda, and.
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chocolate; add in 3 additions to creamed mixture alternately with 2 additions of.
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bananas, mixing just until flour is incorporated.
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Spoon into 2 greased.
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8-1/2-inch (2.25 L) springform pans, smoothing tops.
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Bake in 350F (180C) oven for 35 to 40 minutes or until top springs back.
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when touched.
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Let cool on rack for 20 minutes.
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Remove sides of pans; let cool.
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completely.
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Chocolate Icing: In saucepan, bring half of the cream to boil; pour over.
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chocolate in bowl, whisking until melted.
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Add vanilla.
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Refrigerate until.
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chilled, 1 hour, whisking often.
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On medium speed, beat chocolate mixture just until ridges hold shape.
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Beat.
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remaining cream just until soft peaks form; gently fold into cake mixture.
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With.
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serrated knife, slice cakes in half horizontally.
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Place a top layer, cut side.
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up, on plate.
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Spread top with 3/4 cup (175 mL) icing; cover with single layer of.
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bananas, leaving 1/2-inch (1 cm) border.
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Cover with 1 bottom cake layer, cut.
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side down; repeat with icing and bananas.
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Repeat with remaining top layer, cut side up, and some of the icing and.
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bananas.
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Top with remaining cake layer, cut side down.
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Using palette knife, cover cake smoothly with remaining icing.
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Refrigerate.
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until firm, about 1-1/2 hours.
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Refrigerate until firm, about 40 minutes, or up to one day.
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To serve,.
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drizzle melted chocolate with fork over remaining bananas; let set.
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Arrange on.
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cake.
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Slice with serrated knife.