I like to line the muffin tin with thin slices of home made bread, which are then lightly toasted first. Then i use a fish or other seafood "stuffing" mix, panada "force meat" & etc. to fill & bake the the toasted & buttered bread cups. Beats making a bunch of individual pastry dough cases to fill with various meat mixes.
Personally a baked green pepper stuffed with a bread stuffing flavoured with anchovy is a favourite of mine.