1. Bring a large pot of lightly salted water to boiling. Add pasta; cook al dente according to package directions. Drain; keep warm.
2. Meanwhile, for the Swiss chard, remove and slice the stems. Cut leaves in half lengthwise  and thinly slice; set aside.
3. In a large skillet or Dutch oven cook bacon over medium-high heat 4 to 5 minutes or until lightly browned. Add onion; cook and stir 2 minutes.  Add chard stems; cook 1 minute. Add chard leaves; cook and stir 2 minutes or until wilted.
4. Add pasta and oil; cook and stir until heated through. Top with Parmesan, and serve.

Per serving: 496 calories, 26g fat, 8g saturated fat, 21mg cholesterol, 262mg sodium, 56g carbohydrate, 0g fiber, 11g protein