Lightly coat a medium skillet with cooking spray. Heat skillet over medium heat. In a small bowl beat together eggs, milk, salt, and pepper. Add to skillet. Cook, without stirring, until egg mixture begins to set on the bottom and around the edge. Using a spatula, lift and fold the partially cooked egg mixture so uncooked portion flows underneath. Continue cooking and folding until egg mixture is cooked through, but still glossy and moist. Remove from heat. Stir in the ham and corn.
Place 4 English muffin halves on a baking sheet. Top each with a half slice of cheese, then top with some of the egg mixture. Add remaining cheese slices. Broil 4 to 5 inches from the heat for 1 to 2 minutes or until the cheese melts. Top with remaining muffin halves. Serve immediately. Makes 4 servings.