Truffle Mac & Cheese

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4 tablespoons salted butter, plus more for buttering the baking dish

12 ounces gemelli pasta

1 teaspoon kosher salt, plus more for the pasta water

1 onion, sliced thin

2 teaspoons fresh thyme

1 bulb Roasted Garlic, recipe follows

3 tablespoons all-purpose flour

2 cups heavy cream

4 ounces mascarpone cheese

1 ounce preserved truffles, grated

1 teaspoon freshly ground black pepper

1/2 teaspoon smoked paprika

2 1/2 cups grated white Cheddar

2 1/2 cups grated Havarti cheese

Roasted Garlic:

8 large garlic bulbs

1 to 2 tablespoons olive oil

Pinch kosher salt

Pinch freshly ground black pepper