Cook pasta according to package directions. While the pasta cooks, in a medium saucepan bring marinara sauce to a simmer. Stir in spinach, and when spinach is wilted stir in ricotta cheese. Bring back up to a simmer. Drain the pasta and stir sauce into cooked pasta.
Nutrition per serving: 420 calories; 6g total fat (3g saturated); 460mg sodium; 67g carbohydrates; 7g dietary fiber; 6g sugar (0g added sugar); 18g protein
Bonus: If you have leftover ricotta, it makes an excellent snack! Top ricotta with frozen dark sweet cherries and some sliced almonds. Refrigerate until the cherries are thawed and enjoy!