Heat oven to 375°F (350°F for dark or nonstick cookie sheet). In 12-inch nonstick skillet, cook ham and onion over medium-high heat 3 to 5 minutes or until onions soften and turn translucent. Add eggs to skillet. Cook over medium heat, stirring occasionally from outside edge to center. Cook until eggs are set but still moist; turn off heat. Add cream cheese, spinach and shredded cheese; gently mix until just combined.