Preheat oven to 450ºF. Spray baking dish with cooking spray or grease with butter or cooking oil.
Arrange tater tots in a single layer in the bottom of the baking dish. Place dish of tots the preheated oven and bake for 10 minutes. Meanwhile, prepare the egg mixture.
In a medium mixing bowl, whisk to combine together eggs, 1 cup cheddar cheese, milk, bell pepper, diced onions, and seasoning. Set aside.
After 10 minutes, remove the casserole dish from the oven. Using a flat bottomed glass or a spatula, flatten the tater tots to form a bottom crust in the baking dish. Return the baking dish to the oven for another 10 minutes, until the tater tot crust is golden and slightly crisp. Remove the dish from the oven and turn the oven temperature down to 400ºF.
Pour the egg mixture evenly over the tater tot crust, then sprinkle in the cooked ham. Top the casserole with the remaining 1 cup of shredded cheese.
Bake for 20-25 minutes, until the eggs are set in the middle of the casserole and the top is golden and bubbly. Top with green onions before serving.
Notes
Substitute for whole milk - To reduce the fat and calories in this recipe, substitute 2% milk for whole milk. For a dairy free option, use full-fat coconut milk.