Preheat oven to 350.

Spray cooking spray in a skillet. Sautee veggies {minus tomatoes} over medium heat until tender, about 5 minutes. Season with salt + pepper. Add ham + tomatoes to skillet and cook until heated thru, about 1 minute. Pour cooked veggies + ham into an 8×12 casserole dish or oven-safe stoneware dish.

Beat egg whites and eggs in a bowl. Pour over veggies in casserole dish. Top with cheese. Mix slightly.

Bake for 30-40 minutes, or until eggs are set. Let stand 5 minutes before cutting.