Preheat oven to 350°F (175°C).

Boil potatoes in their skins until tender.

Let the potatoes cool slightly.

Peel the cooled potatoes.

Grate the peeled potatoes.

In a large bowl, combine grated potatoes, sour cream, grated Cheddar cheese, melted butter, salt, and chopped onion.

Mix all ingredients well.

Grease a 2-quart casserole dish.

Transfer the potato mixture to the greased casserole dish.

Sprinkle paprika evenly over the top of the casserole.

Bake in the preheated oven for 30 minutes, or until golden brown and bubbly.