Mediterranean Scalloped Potatoes

0 Preheat the oven to 425°F. Spray a large baking dish with nonstick baking spray, then set aside.
1 Peel the potatoes and rinse. Using a mandolin or a sharp knife, cut the potatoes into half-inch thick rounds. This will ensure they’re thin enough to cook through in the specified amount of time but thick enough so they don’t fall apart during the cooking process.
2 In a large baking dish, add one third of the sliced potato rounds.
3 Add one third of each of the following: butter, milk, cheese, onion and seasonings.
4 Repeat this step twice more until your casserole has THREE layers.
5 Transfer the uncovered scalloped potatoes into the preheated oven.
6 Bake for 45 minutes, checking occasionally to see how the top is browning.
7 When the potatoes are bubbly and the top layer of cheese has browned, remove from the oven. (It took ours around 55 minutes for perfection, but my oven is old, so please keep an eye on yours.)
8 Serve warm, and enjoy!