Caramelized Onion Pasta with Chili Oil

This caramelized onion pasta with chili oil is rich, creamy, and bursting with umami and gentle heat. Slow-cooked onions bring deep sweetness, while chili oil adds the perfect kick. Tossed with fettuccine and Parmesan, it’s a comfort dish with gourmet flair—ideal for weeknights or a cozy dinner in.

Iram Mansoor

Caramelized Onion Pasta with Chili Oil

No ratings yet

This caramelized onion pasta with chili oil is rich, creamy, and bursting with umami and gentle heat. Slow-cooked onions bring deep sweetness, while chili oil adds the perfect kick. Tossed with fettuccine and Parmesan, it's a comfort dish with gourmet flair—ideal for weeknights or a cozy dinner in.

Print Recipe Pin Recipe

Prep Time 10 minutes mins

Cook Time 30 minutes mins

Servings: 3 Servings

Ingredients Method Notes

Ingredients

 

US CustomaryMetric

 

1x2x3x?

• 8 oz fettuccine
• 2 medium yellow onions thinly sliced
• 6 cloves fresh garlic minced
• 2 tbsp butter
• 2 tbsp oil olive or neutral
• 1½ tbsp chili oil adjust to taste
• 2 tbsp tomato paste
• 1 cup unsweetened heavy whipping cream
• 1 cup reserved pasta water
• Salt to taste
• 1 tsp black pepper
• 1 tbsp garlic powder
• 1 tsp onion powder
• 1 tsp Italian seasoning
• ½ cup freshly grated Parmesan cheese
• 1 tbsp dried parsley or fresh, for garnish

Method

 

Boil the Pasta

1. Bring a large pot of salted water to a boil.
2. Cook fettuccine according to package instructions until al dente.
3. Reserve 1 cup of pasta water before draining.
4. Set pasta aside.

Caramelize the Onions

1. In a large skillet, heat 2 tbsp oil and 2 tbsp butter over medium heat.
2. Add thinly sliced onions. Cook for 10 minutes, stirring occasionally.
3. Once onions are translucent, add a pinch of salt and continue cooking on medium-low heat for another 10–15 minutes, stirring every few minutes until golden brown and caramelized.
4. Tip: Don’t rush this step. Slow caramelization builds rich flavor!

Build the Sauce

1. Add minced garlic to the onions and sauté for 1–2 minutes, until fragrant.
2. Stir in tomato paste and cook for 1 minute.
3. Add chili oil, garlic powder, onion powder, Italian seasoning, salt, and black pepper.
4. Pour in the reserved pasta water, scraping any browned bits from the pan.
5. Stir in the heavy cream, and let simmer on medium-low heat for 2–3 minutes, or until slightly thickened.
6. Add Parmesan cheese and stir until melted into the sauce.

Combine & Serve

1. Add the cooked fettuccine directly to the sauce.
2. Toss to coat evenly. If needed, adjust consistency with a splash of pasta water.
3. Garnish with dried parsley (or fresh) and more Parmesan cheese.

Serve

1. Serve warm with:

   – Crusty bread

   – Chili oil drizzle

   – Side salad (arugula or spinach with balsamic)
2. Perfect for a weeknight comfort meal with a touch of spice.

Storage & Reheating

1. Store: Refrigerate leftovers in an airtight container for up to 3 days.
2. Reheat: In a skillet over medium heat with a splash of cream or milk to loosen the sauce.
3. Not freezer-friendly: Cream-based sauces may separate when frozen.

Notes

• Add sautéed mushrooms or baby spinach for extra veg.
• Use tagliatelle, linguine, or rigatoni if fettuccine isn’t available.
• Try vegan cream and cheese substitutes for a dairy-free version.

Tried this recipe?

Let us know how it was!