Preheat your oven to 400°F

Slice your potatoes to 1/8th - 1/16th of an inch thick

Slice you onions as thin as you can. Be sure to create long, thin slices, rather than chopping into small pieces.

Layer potatoes in your casserole dish overlapping like roof shingles

Layer onions

Add a pinch of salt and pepper, along with any additional seasonings/herbs

Layer of cheese

Repeat steps 4-7 until you have reached the top of the dish

When all layers are done pour in milk and cream

Cover with foil and bake for 60 minutes covered 

Uncover and add breadcrumbs and cheese for topping

Bake for an additional 20 minutes uncovered or until top is browned 

Serve