1 lb. German sausage
1 lb. sauerkraut, drained and rinsed
1 c. shredded Swiss cheese
1/2 c. mayonnaise

TOPPING:

4 c. mashed potatoes (instant or fresh)
1/4 c. mayonnaise

Slice sausage into 1/2 inch pieces. Mix all ingredients (except potatoes and 1/4 cup mayonnaise). Prepare potatoes according to package instructions and add 1/4 cup mayonnaise. Put sausage mixture in casserole dish and top with potatoes around edge. Bake at 350 degrees for 30 minutes.