1Make mashed potatoes out of the 5 lbs. of red potatoes. Set aside.
2In a large saucepan melt 1 stick of the butter; add sauerkraut, bell peppers, onion, and garlic. Simmer on a medium heat till onion and peppers are tender (about 10 mins.) Add as much of the second stick of butter as needed to keep the mixture from sticking to the pan and burning ( I generally use both sticks.) Season with salt and pepper.
3Grill or broil the kielbasa till done (I grill it like I would eating it straight from the grill.) After grilling or broiling the kielbasa, slice into 1/4 inch elongated slices. Set aside.
4In a LIGHTLY greased 13"X9"X2" baking pan, make a layer with the mashed potatoes (about 1" thick), then make a layer with the sauerkraut mixture (about 1/2" to 3/4" thick), follow that with a layer made from the kielbasa slices. Cover with shredded cheese.
5Bake at 350 degrees till the cheese is thoroughly melted and turning slightly golden.