01 - Toast the English muffins or bread slices until they achieve a golden-brown hue.
02 - While the bread is toasting, melt butter or heat olive oil in a non-stick skillet over medium heat. Crack the eggs into the warmed skillet and cook to your desired doneness, whether fried or scrambled. Season generously with salt and freshly ground black pepper.
03 - Halve the avocado, discard the pit, and scoop the flesh into a small bowl. Mash the avocado with a fork until it reaches a spreadable consistency. Season with a touch of salt, pepper, and chili flakes if using.
04 - Evenly spread the prepared mashed avocado onto the toasted bread or muffin halves.
05 - On each prepared base, layer one slice of cheddar cheese, followed by the cooked egg, tomato slices, and a handful of baby spinach.
06 - Top each sandwich with the remaining bread or muffin half to complete the assembly. Serve immediately for optimal enjoyment.