French Onion Soup Stuffed Potatoes

Ingredients
For the Potatoes
4 large russet potatoes

1 tablespoon avocado oil (or canola oil or grapeseed oil)

For the French Onion Soup
4 tablespoons salted butter (divided)

1 large yellow or white onion, thinly sliced

1/2 teaspoon coarse kosher sea salt

1/2 teaspoon granulated sugar

1/4 teaspoon ground black pepper

1 teaspoon freshly minced garlic (about 2 cloves)

1 can (14 oz) beef stock

1 teaspoon freshly minced thyme

For the Topping
4 slices Gruyère or Swiss cheese

Instructions
Preparing the Potatoes
Preheat the Oven: