Instant Pot Alfredo Sauce

Easy Instant Pot Alfredo Sauce with Fettuccine

Instant Pot Alfredo Sauce is so easy to make, all you have to do is add all the ingredients to the pot, including the dry pasta and cook to perfection. This is the perfect dump and cook meal.

Course Main Course
Cuisine Italian
Keyword Instant Pot Alfredo Sauce
Prep Time 10 minutes
Cook Time 5 minutes
Building Pressure 10 minutes
Total Time 15 minutes
Servings 4 servings
Calories 831 kcal
Author Catalina Castravet


  • 1 1/2 cups chicken broth or veggie broth
  • 1 cup evaporated milk
  • 1/2 cups heavy cream
  • 1 teaspoon minced garlic
  • 1 teaspoon dried thyme
  • 1 teaspoon Italian seasoning mix
  • 1/4 teaspoon red pepper flakes or less
  • 1/4 teaspoon kosher salt
  • 1/8 teaspoon ground black pepper
  • 8 oz baby Bella mushrooms, sliced optional
  • 1/2 lb dry fettuccine noodles broken in half
  • 1 cup mascarpone cheese room temperature
  • 1 cup parmesan cheese, shredded

Cornstarch Slurry:

  • 1 tablespoon cornstarch
  • 1 tablespoon water


  1. Using a kitchen scale, measure the pasta to make sure you are not using more.

  2. Add the following ingredients to the Instant Pot: broth, evaporated milk, garlic, thyme, Italian seasoning, red pepper flakes, salt, pepper and sliced mushrooms (if using). Stir to combine.
  3. Break the fettuccine noodles in half and add them to the pot. Distribute evenly on top, do not stir, just gently press to soak them into the liquid.
  4. Take the time to check if you have a bunch of noodles stuck together, gently soak them in the liquid, otherwise they will end up glued together when cooked.
  5. Pour the cream over the noodles.


  1. Cover and seal the lid. Make sure the valve points to Sealed.
  2. Change setting to Manual or Pressure Cook and adjust time to 5 minutes.
  3. Once Instant Pot beeps to show that it's done, wait 5 minutes (Natural Pressure Release) and after that do a quick release, by changing the position of the valve to Vent.
  4. Carefully remove lid and gently stir the noodles.
  5. Let them sit in the sauce uncovered for about 1-2 minutes.
  6. Add parmesan cheese and mascarpone, gently stir until fully combined.

Cornstarch Slurry:

  1. The sauce will thicken more as it cools off. However, if you would prefer a thicker sauce, mix cornstarch and water in a small bowl until fully combined.
  2. Select Sauté, add cornstarch slurry to the Instant Pot, stir and simmer for 2 minutes. Sauce will thicken more as it cools off.
  3. To thin out the sauce, add more milk or cream, and stir to combine. Simmer for 1-2 minutes.

Recipe Video

Nutrition Facts
Easy Instant Pot Alfredo Sauce with Fettuccine
Amount Per Serving
Calories 831 Calories from Fat 333
% Daily Value*
Fat 37g57%
Saturated Fat 21g131%
Cholesterol 137mg46%
Sodium 981mg43%
Potassium 983mg28%
Carbohydrates 78g26%
Fiber 2g8%
Sugar 11g12%
Protein 44g88%
Vitamin A 1150IU23%
Vitamin C 2.6mg3%
Calcium 782mg78%
Iron 4.9mg27%
* Percent Daily Values are based on a 2000 calorie diet.