Prepare cake mix according to pkg. directions. Pour the batter into a greased 13x9 in. baking pan. Bake at 350* for 30-35 minutes or until a toothpick inserted near the center comes out clean. Cool on a wire rack.
In a heavy saucepan, combine chips, 1/4 cup milk and cream. Cook and stir over low heat until chips are melted. Remove from the heat; stir in vanilla. Cool to room temperature. Place the remaining milk in a mixing bowl; beat in pudding mixes on low speed for 2 minutes.
To assemble, crumble half of the cake into a 4 - qt. trifle bowl or large bowl. Layer with half of the peanut butter sauce, pudding, whipped topping and candy bars; repeat layers. Cover and refrigerate for at least 3 hours before serving.
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