Pre-Heat oven to 375'° and spray a 8x10" baking dish with non-stick cooking spray.
Heat a medium saute pan to medium heat.
While the pan is heating dice your onions and ham. Once the pan is hot add the oil to the pan, then add the diced ham and onions. Cook on medium heat for 3-5 minutes, stirring every minute or so. This cook time is just to soften up the onions and allow their flavors to open up.
While the ham and onions are cooking, add the egg white liquid and 5 whole eggs to a large bowl. Whisk the eggs and egg whites together for 1 full minute. This adds a little air into your eggs making them fluffy.
By now your ham and onions are done. But before removing from the heat, add your spinach and arugula to the pan, cook with the ham and onions for another 1 minute, just enough for the greens to soften and wilt.
Once the greens have wilted add the ham, onion, and green mixture to your prepped baking dish, spreading the mixture evenly on the bottom of the baking dish. Then top the ham and onions with your whisked eggs. Pour the eggs over top of everything.
Then sprinkle with your freshly shredded cheese, chives, and some black pepper and garlic powder.
Place your baking dish in the oven and cook for 15-20 minutes, until the eggs have puffed up, and the top is a light golden brown color.
While the eggs are baking slice your english muffins in half to build your sandwiches.
In a small bowl scoop out your avocado and smash with a fork. Season with a little black pepper and garlic powder and the juice from one lime. The lime juice will help prevent the avocado from going brown for 2-3 days.
If you plan to eat these sandwiches right away, toast your english muffins. If you plan to eat them later skip toasting the muffins now and go right to assembling them.
Once the eggs are done allow to cool for a few minutes, then cut your casserole into 6 servings.I used a biscuit cutter to cut them into circles, however, you can simply cut them into squares. Using the biscuit cutter you will have a few leftover random pieces of the egg....but i just eat those on their own while I put together the sandwiches.
Now assemble your sandwiches: First by spreading a little smashed avocado onto the bottom half of the english muffin, then top with a portion of your egg casserole and finish with your other half of english muffin.
Serve and enjoy, or see my notes below this recipe on the best way to meal prep these sandwiches.
Macro Nutrition
Nutrition Facts
Ham and Cheese Casserole Sandwich
Amount Per Serving (1 Sandwich)
Calories 463Calories from Fat 147
% Daily Value*
Fat 16.3g25%
Saturated Fat 3.7g23%
Trans Fat 0g
Polyunsaturated Fat 1.6g
Monounsaturated Fat 6.1g
Cholesterol 14.9mg5%
Sodium 490.7mg21%
Potassium 319.4mg9%
Carbohydrates 34.5g12%
Fiber 5.2g22%
Sugar 2.4g3%
Protein 39.3g79%
Vitamin A 18.6IU0%
Vitamin C 13.4mg16%
Calcium 12.8mg1%
Iron 14.9mg83%
* Percent Daily Values are based on a 2000 calorie diet.