Jolean's Cheese Potato & Smoked Sausage Casserole

This was another one of our favorites in the 70's Very inexpensive and very easy to make. Just recently found this recipe hand-written by my Mom, and the warm feelings flood back to me, because this was a true favorite in our house.
Ingredients:

• 3 cups idaho potatoes, peeled, boiled and cut into cubes when cool, approx. 1 lb
• 4 tablespoons butter
• 4 tablespoons flour
• 2 cups milk
• 1/2 teaspoon salt
• 1/4 teaspoon pepper
• 1/2 lb Velveeta cheese, diced
• 1/2 cup sharp cheddar cheese, shredded
• 1 lb skinless smoked sausage (Eckrich is my favorite brand)
• 1/8 teaspoon paprika

Directions:

1. Cut skinless smoked sausage in half, lengthwise, and then chop into 1/2 inch "half moon" cuts. Cook in a frying pan for about 15 minutes, turning frequently to SLIGHTLY brown.
2. Meanwhile, put cooked & diced potatoes in 2 quart casserole. Add cooked meat and give it a gentle toss.
3. Mix all remaining ingredients (except for shredded cheddar cheese & the paprika) in a saucepan over medium heat until warm, melted and smooth. (Use a whisk and stir constantly.).
4. Pour white/cheese sauce over potatoes and meat. Sprinkle shredded sharp cheddar cheese on top, and then sprinkle paprika evenly over the top.
5. Bake in preheated 350°F oven for 35-45 minutes (watch, until golden brown on top).
6. NOTE: You can substitute: 1/2 lb. hot dogs, sliced into 1/2-inch slices OR 1/2 lb. ham diced into 1/2-inch dices OR 12 oz. can of Spam diced into 1/2-inch dices, instead of the smoked sausage.