'tree' stick into a biscuit cube (with pre-baked skewer hole). Weigh down with marzipan/strong icing and stick to serving tray (or they could be stuck in creatively covered foam bases).
"Camping Breakfast : Sausage, egg, and cheese breakfast sandwich. best idea ever" Um, this looks like an egg filled burger but ok. I'm still going with burger though.
Oeuf jambon formage dans un bol fait d'un pain!