This is that big boy you’ve heard about . . . stuffed with bacon, sausage, cheddar cheese, spinach, and mushrooms. Not meant for hot-weather consumption, this incredibly filling omelet should be cut in wedges for multiple servings. It’s truly an omelet to feed them all, with humble origins in my father’s home kitchen, where he uses a 1950s milkshake blender to fluff his eggs back to the glistening dawn of the atomic age.