Not Necessarily Nutrition, But Definitely Good Eating

[MeepyCat]

I have made the thinnest of gossamer sponge cake layers, carved it up carefully into thirds and put it in the freezer. I want to use it to make petits fours.

I was thinking of filling them with dulce de leche and cinnamon cream, but unless I can find dulce de leche at the grocery store (not completely out of the question), it takes too long to make today. I need an alternate plan. The cinnamon cream still sounds good. ANy suggestions on what else to use?

[hibana]

Chocolate ganache, pastry cream or buttercream icing flavored with anything, thick custard, lemon curd, jam? Nutella?