Mousse is actually made with gelatin and in most recipes, stiffly beaten egg whites. I have a recipe for a Bavarian Cream filling made with instant Jello pudding mix and whipped Pastry Pride that is excellent, it can be flavored with any extract you like that compliments the flavor of the cake. Or you can add any liquere.
http://forum.cakecentral.com/cake_recipe-2396-Bavarian-Cream-Filling.html
In a pinch I have used 1 box instant Jello chocolate pudding mix and 2 cups Heavy whipping cream with Hershey chocolate powder for taste. The customer actually loved it too...
I always use this - instant pudding mix and heavy cream - everyone loves it, including me!
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