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Caramelized Onion Alfredo Pasta Sauce Recipe

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This caramelized onion alfredo pasta sauce recipe is a rich and delicious dinner, full of flavor! Made with spices, garlic, and sweet onions. 

It’s a simple alfredo recipe with a fun flavorful twist. Serve with a garlic knots and fresh chopped salad for a complete meal.

vegan onion alfredo sauce with caramelised onion pasta gluten free noodles with onions recipe with gluten free linguine or fettuccini and caramelized onions in the dutch oven
 
I’ve been loving adding caramelized onions to everything lately, and this caramelized onion alfredo pasta is one of my favorite recipes so far!  I’ve recently been making large batches of my Quick 30 Minute Caramelized Onions which couldn’t be easier to make: one pot, some onions and spices, and you have soft and flavorful caramelized onions fast.
 
The sweetness of the caramelized onion goes great with the bold garlic, creamy sauce, and bright fresh parsley finish on this pasta. This is some seriously tasty comfort food!

This Caramelized Onion Alfredo Pasta Recipe Is:

  • Rich
  • Thick
  • Creamy
  • Garlicky
  • Made with Pantry Staple Ingredients
  • Ready Quickly
creamy vegan pasta with caramelized onions in a kitchen studio with accessories. the pasta has plant based milk instead of butter and garlic and soft and sweet caramelized onions pasta

What’s In This Alfredo with Caramelized Onions?

Be sure to visit the recipe card below for full ingredient amounts and recipe instructions!

  • Onions: sliced into thin even strings
  • Fettuccine: I used a long fettuccine pasta, but you can use linguine, spaghetti, angel hair, bucatini, or any other long pasta shape! You can use regular pasta, or even a gluten free variety if desired.
  • Butter
  • Garlic: you can use fresh garlic if you have it, or heirloom jarred garlic if you are making this pantry-staple friendly.
  • Flour
  • Milk
  • Vegetable Stock
  • Parmesan Cheese
  • Garlic Salt: for a little extra flavor and spice in this pasta.
  • Fresh Ground Pepper: I use tellicherry pepper corns because they have a nice flavor with a hint of spice, and are a great value for the quality of fresh pepper corns.
  • (Optional) Parsley: to give the alfredo pasta sauce a bright fresh finish.
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Easy Weeknight Pasta Recipes!

This caramelized onion alfredo is what I call an Easy Weeknight Meal – which is on your table in about 30 minutes or less.  These quick and simple recipes are perfect for those nights when you want a home-cooked meal but don’t want to spend hours in the kitchen.

I have a whole section of The Herbeevore dedicated to Easy Weeknight Meals, that are great for the whole family. From soups and stews, to pastas and proteins – a tasty meal can be on your table in no time.  Even faster than ordering takeout!

And if you love this recipe, check out my Oat Milk Mac and Cheese for a super creamy, decadent treat!

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How Do I Make This Caramelized Onion Pasta Recipe?

  1. Caramelize the Onions: In a Dutch Oven or other heavy lidded pot, add the onions, olive oil, and sea salt.  Sauté on low heat, and stir with a wooden spoon for 25 minutes until the onions begin to reduce. After 25 minutes, add the vegan Worcestershire sauce and sauté for 5 additional minutes.
  2. Cook pasta according to package instructions.
  3. While pasta is cooking, in a large pot heat butter over low heat. Add the garlic and sauté for 2 or 3 minutes until the garlic begins to brown. Sprinkle in the flour and stir until a thick paste forms.
  4. Add the milk, vegetable stock, garlic salt and pepper, and parmesan cheese to the pot. Stir well until a thick sauce forms.  Add the caramelized onions and pasta to the sauce, toss well,  and top with parsley and black pepper if desired. 
  5. If sauce is too thick, add additional milk 1/4 cup at a time until the sauce reaches desired consistency.  If sauce is too thin, add an additional tablespoon of flour until it reaches desired consistency.
vegan sweet onion pasta sauce dairy free alfredo with caramelized onions gluten free dairy free no butter and garlic for pasta sauce healthy italian onion dinners

More Easy Pasta Recipes You’ll Love!

Oat Milk Mac and Cheese Recipe (Gluten Free, Vegetarian)

Creamy Pumpkin Lentil Pasta Recipe (Vegan, Gluten Free)

One-Pot Pho Recipe (Vegan, Vegetarian, GF)

Instant Pot Pantry Pasta Recipe (Vegan, Gluten Free, Pantry Staple)

Vegan Chickpea Noodle Soup Recipe (High Protein, Gluten Free)

sweet onion alfredo sauce with caramelized onions creamy onion noodles recipe vegan onion pasta gluten free noodles with caramelized onions

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vegan onion alfredo sauce with caramelised onion pasta gluten free noodles with onions recipe with gluten free linguine or fettuccini and caramelized onions in the dutch oven

Caramelized Onion Alfredo Pasta

This caramelized onion alfredo pasta sauce recipe is a rich and delicious dinner, full of flavor! Made with spices, garlic, and sweet onions. 
5 from 3 votes
Cook Time 45 minutes
Total Time 45 minutes
Course Dinner, Pasta
Cuisine American, Italian
Servings 4 servings
Calories 437 kcal

Ingredients
  

For the Caramelized Onions

  • 2 sweet onion thinly sliced
  • 2 tablespoons olive oil
  • 1/4 teaspoon Sea Salt
  • 1 tablespoon Worcestershire sauce

For the Pasta

  • 8 ounces pasta of choice
  • 4 tablespoons butter
  • 4 cloves garlic minced
  • 1/4 cup all-purpose flour
  • 1/2 cup milk
  • 1.5 cups Vegetable Stock
  • 3/4 teaspoon garlic salt
  • 1/4 teaspoon Black Pepper
  • 3/4 cup parmesan cheese
  • 1/4 cup fresh parsley optional

Instructions
 

  • Caramelize the Onions: In a Dutch Oven or other heavy lidded pot, add the onions, olive oil, and sea salt.  Sauté on low heat, and stir with a wooden spoon for 25 minutes until the onions begin to reduce. After 25 minutes, add the vegan Worcestershire sauce and sauté for 5 additional minutes.
  • Cook pasta according to package instructions.
  • While pasta is cooking, in a large pot heat butter over low heat. Add the garlic and sauté for 2 or 3 minutes until the garlic begins to brown. Sprinkle in the flour and stir until a thick paste forms.
  • Add the milk, vegetable stock, garlic salt and pepper, and parmesan cheese to the pot. Stir well until a thick sauce forms.  Add the caramelized onions and pasta to the sauce, toss well,  and top with parsley and black pepper if desired. 
  • If sauce is too thick, add additional milk 1/4 cup at a time until the sauce reaches desired consistency.  If sauce is too thin, add an additional tablespoon of flour until it reaches desired consistency.

Notes

To Make Your Own Unsweetened Oat Milk:
  1. .Combine 1 cup oats, 4 cups water, and pinch of salt to a blender.  Allow the ingredients to sit for 10 minutes before blending.
  2. Blend on high for 30 seconds.  Strain immediently though a fine mesh strainer, cheese cloth, or a nut milk bag. Do NOT squeeze the oat milk, let it drain naturally. Squeezing it can cause it to become slimy.
To thicken your sauce: add 1 tablespoon of water to 1 teaspoon of cornstarch in a seperate bowl, mix well to combine. Add corn starch mixture to the pasta sauce while it is warming and stir for a minute or two until it thickens.

Nutrition

Calories: 437kcalCarbohydrates: 63gProtein: 10gFat: 16gSaturated Fat: 2gSodium: 688mgPotassium: 335mgFiber: 4gSugar: 14gVitamin A: 567IUVitamin C: 11mgCalcium: 213mgIron: 2mg
Did You Make This Recipe?Please leave a rating and comment below, let us know what you loved about it!

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