Add potato and 1/4 cup water to a microwave safe bowl. Cover and microwave for 4 minutes or until softened. set aside,
Whisk eggs and milk in a bowl. Add potatoes, corned beef, tomatoes, green onion, hot sauce, paprika, salt, black pepper, and 1/2 cup cheddar cheese. Stir to combine.
Place in greased 1.5 qt casserole dish and top with remaining cheese.
Bake for 35-40 minutes or until eggs are set and cheese is bubbling.