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Bring a large pot of salted water to a boil. Add the fusilli and cook for 1 to 2 minutes less than the package instructions. Reserve 1/2 cup of the pasta water, then drain and set aside.
Meanwhile, cook the bacon in a heavy-bottomed skillet over medium heat until crisp, 8 to 10 minutes. Remove to a paper towel-lined plate and remove all but 2 tablespoons of the grease from the skillet. Add the thyme, onion and garlic to the skillet and cook until softened, about 5 minutes. Add the wine and cook until mostly evaporated, 1 to 2 minutes. Add the cream and heat until bubbly, 30 seconds. Gradually add the fontina, Cheddar, Romano and Gruyère in handfuls, letting each combine with the cream before adding the next.
Add the pasta to the skillet along with a good pinch of salt and pepper. Toss everything together, thinning with the reserved pasta water if needed. Divide the pasta into 8-ounce individual gratin dishes (or 1 flameproof casserole dish) and set on a baking sheet. Divide the mozzarella pearls over the top of the pasta.
Position an oven rack in the center of the oven and preheat to broil.
Broil on the center rack until the mozzarella pearls are brown and the pasta is bubbling, 3 to 4 minutes. Remove and garnish with the cooked bacon and sliced scallion greens.
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