Preheat oven to 400° and spray a 14 x 11½ x 2¼ baking dish with a non stick spray. Set aside.

Peel and thinly slice potatoes, approximately ⅛" thick. Place in a large bowl until ready to use.

In a large frying pan, melt butter over low flame then add onions and garlic. Saute for about 4-5 minutes.

Sprinkle flour over onion mixture, stir and cook for a couple minutes.

Gently pour vegetable broth into pan and stir, add salt and pepper, seasoning and heavy cream. Stir until thickened, remove from heat just prior to boiling and then add 2 cups of cheddar cheese. Stir.

Layer ⅓ of the potato slices in baking dish then add ⅓ of the sour cream and ⅓ of the cheese sauce over the potatoes.

Top with ⅓ of the Parmesan, ⅓ pepper jack cheese and ⅓ of cheddar cheese.

Repeat layering 2 more times ending with cheddar cheese.

Cover with foil and place in oven. Cook for 1½ – 2 hours.

About 15 – 20 minutes prior to potatoes being done, remove foil to brown the cheese a bit.

Remove from oven, let sit for about 15 minutes, then enjoy.