Preheat oven to 400º F. Arrange Canadian Bacon on a wire rack which has been placed on a rimmed baking sheet. Bake until lightly browned, about 15 minutes.
Meanwhile, spray a muffin pan with nonstick cooking spray. Break an egg into each of the cups of the muffin pan. Add to the oven the last 10 minutes of cooking time for the bacon. Cook until the yolk has set, about 10 minutes.
Meanwhile, split English muffins in half, spread with butter, and arrange on a baking sheet. Add to the bottom rack of the oven the last 10 minutes of cooking time for the bacon.
Remove all from the oven and assemble the Egg McMuffins. Add a slice of cheese to a warm slice of English muffin. Top with an egg followed by a slice of Canadian bacon. Add the other half of the English muffin to the top of the McMuffin and serve warm.
Make-Ahead Egg McMuffin
Allow the assembled Egg McMuffins to cool then store in the refrigerator for up to 3 days. Reheat in the microwave for serving.
Freezer Friendly Egg McMuffins
Wrap each cooled Egg McMuffin individually with freezer-safe plastic or foil. Then store in a freezer-safe container for up to 3 months. Reheat in the microwave for serving.