Wash, peel, and slice potatoes. Boil with 2 cloves sliced garlic. Mash potatoes and garlic with butter, sour cream and season with salt, peppper, and garlic salt.
Sautee chopped zucchini, 2 cloves of chopped garlic, and chopped onion over medium/high heat in butter, until tender. Season with garlic pepper.
Cook Brats as directed on package. Let cool until able to handle and slice. (I cut them with kitchen scissors)
In 9x13 baking dish spread mashed potatoes evenly, top with slices of Italian cheese, top with sautee mixture, Brat slices, and shredded cheese. Bake in 350 degree oven 10-15 minutes, or until cheeses are melted.