Combine ham and egg in a small bowl; whisk to blend. Set aside.
Heat oil in small nonstick skillet over medium heat.
Add spinach; cook, stirring frequently, for 2 to 3 minutes, or until wilted. Remove from skillet. Set aside.
Add egg mixture to skillet; cook over medium-low heat, stirring frequently, for 2 to 3 minutes or until egg is set.
Top bottom English muffin with spinach, egg mixture, cheese, and top English muffin.