Pre-heat the oven to 400°F.
Rub the potatoes with a little oil; season with salt and pepper and prick the skins with a fork. Roast for 1 hour; cool to handle. Halve the potatoes lengthwise down the center.
Heat a large skillet with a lid over medium heat. Add the butter and melt; when it foams, add the onions and season with salt. Cover the pan and cook for 10 minutes, stirring occasionally. Uncover and cook 20 minutes more, stirring occasionally.
Scoop the flesh of the potatoes into a bowl, leaving the skins intact. Mash with salt, pepper, crème fraiche or cream and the Fontina or Gruyère. Arrange the potato skins on a baking sheet and top with
the Parmigiano Reggiano..
Coat the broccoli with a little olive oil; season with salt and pepper and roast to crispy at edges and tender, 20-25 minutes. Roast the potatoes on another rack at same time until brown and bubbly.
Serve the potatoes topped with the roasted broccoli spears.
This is one of many “Yum-o!” recipes – it’s good and good for you. To find out more about Yum-o!, Rachael’s nonprofit organization, visit