INGREDIENTS
Salt and pepper
4 lb
baking potatoes, scrubbed
1 tbsp
unsalted butter
1
onion, finely chopped
2 cloves
garlic, finely chopped
1 1/2 cups
shredded Gruyère (about 5 1/2 oz.)
1 1/2 cups
shredded Cheddar
3/4 cup
grated Parmesan
1 tbsp
chopped fresh thyme
2 cups
heavy cream
3
bay leaves