Prepare the Chipotle Mayo: In a small bowl, blend together mayonnaise, minced chipotle peppers in adobo, and lime juice until smooth.

Cook the Eggs: Heat a nonstick skillet and add butter or oil. Crack eggs into the skillet and cook until the whites are set and the yolks are slightly runny.

Toast the Muffins: Split and toast English muffins until golden brown and crisp.

Assemble the Sandwich: Spread chipotle mayo on each muffin half, add cheddar cheese, cooked egg, bacon or sausage (if using), and top with avocado or spinach.

Serve Immediately: Press the top muffin half onto the sandwich and serve while warm.