Name: Caramelized Onion & Garlic Spaghetti
Prep time: 15 min
Cook time: 33 min
Total time: 50 min
Cuisine: Italian
Ingredients: 8 oz spaghetti; 1 large onion, thinly sliced; 4 garlic cloves, minced; 2 tbsp butter; 1 tbsp olive oil; 2 tbsp chili crisp; 1 cup heavy cream or room-temperature coconut milk; 1 tbsp soy sauce (optional); 1/2 cup grated Parmesan cheese; 1 tsp smoked paprika; 1 tsp garlic powder; 1 tsp onion powder; 1 tsp seasoned salt; 1 tsp black pepper; 1 tsp chili powder; 1 tsp Italian seasoning; Reserved pasta water, as needed; Fresh parsley, for garnish (optional); Extra chili crisp, for garnish (optional)

I make this Caramelized Onion & Garlic Spaghetti when I want something deeply comforting yet a little elevated. The slow-cooked onions bring a natural sweetness, the garlic adds warmth, and the creamy, cheesy sauce wraps everything together into a silky, satisfying dish with a subtle kick from chili crisp.

Why You’ll Love This Recipe

I love how this recipe transforms simple pantry ingredients into something rich and layered. The caramelized onions create a deep flavor base, while the cream and Parmesan give the pasta a luxurious texture. I also enjoy how flexible it is, since I can easily adjust the spice level or swap the cream for coconut milk. It feels cozy enough for a quiet night but still impressive enough to serve to others.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

8 oz spaghetti

1 large onion, thinly sliced

4 garlic cloves, minced

2 tbsp butter

1 tbsp olive oil

2 tbsp chili crisp

1 cup heavy cream or room-temperature coconut milk

1 tbsp soy sauce (optional)

1/2 cup grated Parmesan cheese

1 tsp smoked paprika

1 tsp garlic powder

Reserved pasta water, as needed

1 tsp onion powder

1 tsp seasoned salt

Fresh parsley, for garnish (optional)

1 tsp black pepper

1 tsp chili powder

Extra chili crisp, for garnish (optional)

1 tsp Italian seasoning

Directions

I start by thinly slicing the onion, mincing the garlic, and measuring out all the seasonings. I also make sure the cream or coconut milk is at room temperature so it blends smoothly later.

I bring a pot of salted water to a boil and cook the spaghetti until al dente. Before draining, I reserve some pasta water for the sauce.

In a large skillet over medium heat, I melt the butter with the olive oil, then add the onions. I cook them slowly for about 15 to 20 minutes, stirring occasionally, until they become soft, golden, and deeply caramelized. If they start to stick, I add a small splash of water.

I stir in the garlic along with smoked paprika, garlic powder, onion powder, seasoned salt, black pepper, chili powder, and Italian seasoning. I let everything cook for about a minute until fragrant.

Next, I add the chili crisp and stir for another minute to deepen the flavor.

I pour in the cream or coconut milk and add the soy sauce if I feel like enhancing the umami. I let the sauce simmer gently until it warms through and slightly thickens.

I mix in the Parmesan cheese until it melts into a smooth, creamy sauce.

Then I add the cooked spaghetti to the skillet and toss everything together. I gradually add reserved pasta water until the sauce turns glossy and coats the pasta perfectly.

I serve it hot, finishing with fresh parsley and an extra drizzle of chili crisp when I want a little more heat.

Servings and timing

Servings: 6 servings

Prep Time: 15 minutes

Cooking Time: 33 minutes

Total Time: 50 minutes

Variations

I sometimes swap the heavy cream for coconut milk to make it dairy-free while still keeping it creamy. When I want extra protein, I add grilled chicken or sautéed mushrooms. If I prefer a milder version, I reduce the chili crisp and chili powder. For a sharper flavor, I like to mix in a bit of Pecorino Romano along with the Parmesan.

Storage/Reheating

I store leftovers in an airtight container in the refrigerator for up to 3 days. When reheating, I add a splash of water or milk to loosen the sauce and warm it gently on the stove or in the microwave. I find that stirring occasionally helps bring back the creamy texture.

Related Recipes:

Baked Cream Cheese Spaghetti

FAQs

Can I make this recipe dairy-free?

I use coconut milk instead of heavy cream and skip the Parmesan or replace it with a dairy-free alternative, and it still turns out creamy and flavorful.

How do I properly caramelize onions?

I cook them slowly over medium heat and stir occasionally. I avoid rushing the process because that deep golden color and sweetness take time to develop.

What can I use instead of chili crisp?

I sometimes use red pepper flakes or a bit of chili oil. The flavor will be slightly different, but it still adds a nice warmth.

Can I make this ahead of time?

I can prepare the sauce ahead, but I prefer cooking the pasta fresh and combining everything just before serving for the best texture.

Why is my sauce too thick?

I fix this by adding reserved pasta water a little at a time until the sauce loosens and coats the pasta smoothly.

Conclusion

I enjoy how this caramelized onion and garlic spaghetti turns simple ingredients into a rich and comforting meal. The balance of sweetness, creaminess, and gentle heat makes it a dish I keep coming back to whenever I want something easy yet satisfying.

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