Preheat your oven to 350°F. You gotta get that heat going while you prep the filling.
Start by browning the ground beef in a big skillet over medium heat. Cook it till it’s nice and fully done. Drain any extra fat so it doesn’t get greasy.
Chuck in the diced onions, green peppers, and minced garlic right into the skillet with the beef. Saute till veggies soften and smell amazing.
In a large bowl, mix up the beef-vegetable mix with sliced potatoes, cream of mushroom soup, and the sour cream. Add salt and pepper just how you like it.
Spread the whole mixture into a greased 9x13 baking dish. Don’t crowd it; spread it even so it cooks uniformly.
Cover the dish tightly with foil and pop it in the oven. Let it bake for about 25 minutes, letting all those flavors meld.
Time to reveal that cheesy layer. Take the foil off and sprinkle shredded cheddar cheese over the top. Put it back in the oven 5 minutes more till cheese like melted butter.
When it’s out, heap French fried onions on top for that crunchy, salty wow moment. Let it cool a little and then dig in!
Notes
Serve this casserole hot with a side of your favorite veggies for a complete meal.