Heat the oven to 350°F and spray a casserole dish with cooking spray. Peel and slice the potatoes into wheels.

Mix the sour cream, soup, cheddar cheese, spring onions, salt, and pepper together in a large bowl. Add the sliced potatoes and stir so that all the potatoes are coated. 

Pack the potato mix into the sprayed casserole dish. 

Mix the melted butter with the corn flakes and layer on top of the potato base. Bake in the oven for 1 hour or until the potatoes are cooked through.