In a large bowl, whisk together eggs, milk, 1 teaspoon House Seasoning blend and mustard powder.
Line your slow cooker with a slow cooker liner or spray with non-stick cooking spray.
In the crock of your slow cooker, layer 1/3 of the potatoes, 1/3 of the ham, 1/3 of the onion, 1/3 of the pepper, 1/2 teaspoon of House Seasoning blend and 1/4 of the cheese.
Repeat layer two more times.
Pour egg mixture over top.
Cover and cook on low for 6 hours.
Before serving, place remaining cheese on top, cover and cook for an additional 10 minutes or until cheese melts.
Serve with sliced green onions on top.