Ingredients
Serves 6
3 medium sweet potatoes (about 2½ lbs), sliced into ?-inch round (peeled or unpeeled)
2 tablespoons butter
1 small onion, thinly sliced
2 garlic cloves, minced
2 teaspoons fresh thyme leaves, divided
1 cup shredded gruyere cheese (or sharp cheddar)
½ cup / 125 ml heavy cream
½ cup / 125 ml milk
Salt and pepper
Preparation
