Combine the sweet potatoes and bacon on a large rimmed baking sheet. Season with salt and pepper and drizzle with the oil. Toss to combine. Roast for 30 minutes, stirring occasionally.
Remove from the oven. Sprinkle over the paprika and add the onion to the pan. Toss to combine and place back in the oven to continue roasting for 15 more minutes.
While the vegetables are roasting, cook the pasta according to package directions. Drain, reserving some of the cooking water - usually about ¼ cup.
Remove the vegetables from the oven and scrape into a large bowl. Pour the water into the sheet pan and scrape up any browned bits and add that to the bowl. Add the pasta, chives (reserving some for garnish,) and parmesan cheese. Toss to combine. Taste and adjust salt and pepper.
Notes
Bacon - can use pancetta. If using prosciutto add it when you add the onions. Pasta shape - I love this using bow tie pasta. Any shaped pasta will work. This is also good with whole wheat pasta. Chives - can substitute parsley or even sage!