You can make omelets (most simply--there are also frittatas and the like) with just eggs plus whatever cut up. Normally I wouldn't used canned goods--though I suppose I could use canned sardines/small shrimp/etc. or various canned mexican and asian vegetables. Both bacon and grated cheese keep a long time in the fridge and there are various things you could freeze in small batches including vegetables out of the supermarket freezer section. An omelet is one of my lazy go tos when I don't have anything else really ready to go.