Heat a medium nonstick skillet over medium heat.
Spread a thin layer of mayo or butter on the cut side of the English muffin halves.
Lay the muffin slices mayo side down on the hot pan and toast until golden.
Once toasty, set aside, placing the slice of cheese on one toasted muffin half.
Reduce the heat to medium-low, then add the olive oil to the hot pan.
Add the egg, slow stirring until it scrambles up. Push to one side and season with salt and pepper.
Add the English muffins back to the pan, untoasted sides down.
Layer the the scrambled egg on top of the cheese, followed by the tomato slices, lettuce, lemon, avocado (if using), salt, pepper, and the remaining muffin slice. Enjoy!