Caramelized Onion and Old Cheddar Mashed Potatoes

Caramelized Onion and Old Cheddar Mashed Potatoes
large white onions, thinly sliced
oil
salt
cracked black pepper
potatoes
butter, melted
cream
grated old cheddar cheese

Heat a little oil in a large, wide pan over medium-high heat. Add the onions and cook, stirring often, until onions are caramelized. Season with salt and pepper.
Meanwhile, boil the potatoes until tender, drain, and mash. Stir in the onions along with some melted butter and cream. Stir in the cheese, then additional salt and pepper to taste.