Preheat oven to 375F and grease a 2qt or 9x9" casserole dish.
In a large mixing bowl, toss together the potatoes, ham, onions.
3 cups peeled and diced potatoes, 2 cups cubed ham, 1/2 cup diced onions
Add the peppers with the flour.
1/2 cup diced peppers, 3 Tbsp all-purpose flour
Add in the cheese, chicken soup, and sour cream. Mix everything together. Spoon the mixture into the prepared baking dish.
1 cup shredded cheese, 1 can condensed cream of chicken soup, 1/2 cup sour cream
Bake for 45-60 minutes until bubbly and potatoes are tender.
Notes
Leftovers can be covered and stored in the fridge for up to 3 days.
How to make in advance:
Prepare the whole recipe and spoon the mixture into your baking dish. Cover and refrigerate up to a day in advance. Remove from the fridge and preheat the oven. Bake as instructed.
How to freeze:
Uncooked - Transfer the casserole mixture to a freezer-friendly container and store in the freezer for up to 3 months. Thaw overnight in the fridge and bake as instructed.Fully baked - Once the casserole is completely cooled, transfer it to a freezer-friendly container and store in the freezer for up to 3 months. Thaw overnight in the fridge and reheat in the microwave before serving.