How to Make It
Preheat the oven to 375°. Place the English muffins on a rimmed baking sheet and top each bottom half with 1 slice of American cheese. Bake until the cheese melts, 2 to 3 minutes.
Meanwhile, in a large nonstick skillet, melt the butter. Add the eggs and cook over low heat, stirring, until curds begin to form, about 2 minutes. Season with salt and pepper and continue cooking until the eggs are just set, about 2 minutes longer. Spoon the eggs over the cheese and top with the avocado wedges. Garnish with scallions, close the sandwiches and serve.