Preheat the oven to 450 degrees. Line a small baking sheet with foil.
Place the English muffin halves cut-side up on the baking sheet. Top each with tomato and drizzle with the olive oil. Sprinkle the Canadian bacon over the tomatoes, then top with the mozzarella. Bake for 10 to 12 minutes, or until the cheese is melted and beginning to brown. Sprinkle with basil.