In a large bowl, whisk together eggs, egg whites, non-fat milk, mustard, ½ teaspoon of salt and pepper. Set aside.
Heat oil in 10-inch oven-safe skillet over medium-high heat. Add spinach and sauté until wilted. Sprinkle with ¼ salt.
Toss in potatoes or sweet potato tater tots and ham.
Pour in egg mixture, reduce; reduce heat to medium. Top with shredded cheese.
Cook for 5 minutes, occasionally running a spatula between the egg mixture and side of the pan.
Sprinkle with Parmesan and transfer to the oven.
Bake at 400 degrees F. for 15 minutes or until set in the center. Broil on high for 3 minutes to brown.
You can use sweet potato, regular tater tots, or even hash browned potatoes in this recipe, depending on your preference.
This frittata recipe can also be put into muffin cups for individual servings.
It would be best if you had an oven-safe pan to make this recipe.
Store any leftover frittata in an airtight container in the refrigerator for up to 5 days. Nutritional information is approximate and was calculated using a recipe nutrition label generator.★ Did you make this recipe? Don't forget to give it a star rating below!