Potato Spinach Casserole

Ingredients

• 1 2/3 cups frozen hash browns, country style (about 12 ounces, thawed)
• 1/2 cup green pepper (finely chopped, divided)
• 1/2 cup onion (finely chopped, divided)
• 1/2 teaspoon salt
• 1/2 teaspoon black pepper
• 1 can evaporated milk, nonfat (12 ounces)
• 6 egg whites from large eggs (3/4 cup)
• 1/2 cup cheese, reduced-fat sharp cheddar, shredded
• 1/2 cup cheese, reduced fat Monterey Jack, shredded
• 1 cup spinach (washed and chopped, fresh)
• 1/2 cup tomatoes (chopped, fresh)