Preheat the oven to 375°. Generously grease a 9 x 13 baking dish with cooking spray.
Place the English muffin pieces across the prepared baking dish. Scatter the cubed butter on top, followed by the Canadian bacon.
In a large bowl, whisk together the eggs, milk, cream, garlic powder, salt, and pepper. Pour the egg mixture over the bread and bacon, completely covering it.
Cover with foil and bake for 30 minutes. Uncover and sprinkle the paprika on top. Bake uncovered until lightly browned, about 30 more minutes.