On a flat-top grill or griddle, gently start to cook the bacon over medium heat. When it renders off a small amount of fat use this to grease the spot where the egg will cook.
Crack the egg onto the prepared grease spot. Cook to preferred doneness.
Halve the English muffin and toast the inside by placing it on the skillet or grill until brown.
Make the sandwich by adding the bacon and egg, then top with ketchup. Tip: Break the cooked egg when it is still runny and spread it over the sandwich. If you bite into an unbroken runny yolk it can get messy fairly quickly.