Preheat oven to 375 degrees Fahrenheit.
Butter a square baking dish. Layer 1 lb of sliced potatoes into the pan. Next add 1/4 cup of grated Murray's Irish Cheddar. Repeat until all potatoes and cheese are used.
In a medium saucepan sauté onions and thyme in Murray's extra virgin olive oil. Once the onions are caramelized, add the heavy cream. When warmed, pour over the potatoes.
Place in oven (I put my pan on a baking sheet to catch any cream that bubbled over) and bake for an hour until the potatoes are tender and cheese bubbly.
Remove from oven and top with bacon and scallions.