Baked Eggs “Flamenco”

I love baked eggs, so I was delighted to come across this elaborate version, served as an appetizer before a Spanish dinner (I like it at brunch). When it was made for me, it contained small amounts of asparagus and peas, but you could use bits of any vegetable you like; leftovers are the best option. Use both meats, either, or neither; this is essentially a dish that was created to combine eggs with whatever else is on hand.