It only occurred to me last week that you can buy enchilada sauce at the store. That epiphany came pretty much at the same time as the one where I realized that enchilada sauce is "that red stuff that makes Mexican food taste like Mexican food." Which is to say outrageously delicious. My life just hasn't been the same since.
So previous huevos rancheros attempts weren't so good, and I would have to go get them at the only Mexican place in town, where they happened to be the cheapest menu item at 12 bucks. TWELVE! Gah. If you have the foresight to keep some refried beans and enchilada sauce in the house, this is the easiest, fastest, most delicious breakfast, lunch or dinner.
Heat a (small corn) tortilla in a pan, spread on a layer of refried beans and some shredded cheese. In the other side of the pan, fry an egg to your liking. Plop the fried egg onto the tortilla and pour some enchilada sauce on top.
Repeat as many times as you like. Serve with salsa.