Photo of Spaghetti with Caramelized Onions by WW

Spaghetti with Caramelized Onions

PersonalPoints™ per serving
Total Time
10 hr 10 min
10 min
10 hr
Sweet, rich golden caramelized onions turn simple dishes into something special. We’ve used them here as a topping for pasta, but they also pair well with any grilled protein.


Uncooked sweet onions

5 large, sweet onions such as Texas Sweet or Vidalia (about 4 1/2 pounds), sliced

Extra virgin olive oil

2 tbsp(s)

Kosher salt

1¼ tsp(s), divided

Bay leaf

1 leaf/leaves, large

Uncooked spaghetti

12 oz

Black pepper

¼ tsp(s), (or to taste)

Grated Parmesan cheese

¾ cup(s), or shaved

Fresh thyme

6 sprig(s), optional


  1. In a 5- or 6-qt slow cooker, mix together onions, oil, and 1/2 tsp salt. Tuck in bay leaf. Cover and cook until onions are golden and softened, about 6 hours on Low.
  2. Stir onions. Partially cover and cook, stirring once or twice, until onions are golden brown and most of liquid is evaporated, 4 to 5 hours on High. Stir in remaining 3/4 tsp salt. Remove and discard bay leaf.
  3. Meanwhile, cook spaghetti according to package directions. Drain and cover to keep warm.
  4. Divide pasta evenly among 6 large shallow bowls and top with onion mixture. Sprinkle with pepper, Parmesan, and thyme, if using.
  5. Per serving: about 1/2 cup onion, 1 cup pasta, and 2 tbsp cheese