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April 8, 2025

Nancy’s Casserole

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Nancy’s Casserole–a creamy, one-pot Instant Pot pasta made with tender chicken thighs, sautéed mushrooms, penne, and spinach in a savory parmesan-balsamic sauce.

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Nancy's Casserole

Nancy’s Casserole

This satisfying one pot meal is made with minimal fuss in your Instant Pot. With tender bites of chicken, mushrooms and penne pasta covered in a creamy parmesan sauce this dinner is comforting and hearty. The pops of color from spinach and peppers add some variety. You can easily swap out the penne with another short cut pasta like macaroni, rigatoni or cavatappi. Enjoy!

Ingredients/Substitution Ideas

  • Butter
  • Mushrooms
  • Kosher salt
  • Black pepper
  • Onion powder
  • Garlic powder
  • Chicken broth–or water and Better than Bouillon chicken base
  • Penne pasta–or another short cut pasta
  • Cherry pepper–or half red bell pepper
  • Boneless skinless chicken thighs–or rotisserie chicken, boneless chicken breasts
  • Half and half–or cream, evaporated milk
  • Cornstarch
  • Parmesan cheese
  • Balsamic vinegar–or red wine vinegar
  • Spinach–or 1 cup of peas

Steps

Turn Instant Pot to saute setting. When display says HOT add in 2 Tbsp of the butter and let it melt. Add in the mushrooms and saute for 5 minutes. Stir in the salt, pepper, onion powder and garlic powder. 

Pour in the broth and scrape the bottom of the pot so that nothing is sticking. Turn off Instant Pot. 

Sprinkle in the penne and pimento. Top evenly with the chicken. Add in the remaining 2 Tbsp of butter.

Cover Instant Pot and secure the lid. Make sure valve is set to sealing. Set the manual/pressure cook button to 4 minutes. When time is up let pot sit for 5 minutes and then move valve to venting. Remove the lid.

Stir in the half and half. In a small bowl stir together 1 Tbsp cornstarch and 1 Tbsp cold water until smooth. Then turn Instant Pot to saute setting. Stir the slurry into the pot to thicken the sauce. Once thickened turn off Instant Pot.

Stir in the parmesan, vinegar and spinach.

Serve and enjoy!

Nancy's Casserole

Notes/Tips

  • Serve with a green salad and garlic bread.
  • Try swapping out the spinach with cooked peas or broccoli.
  • I used my 6 quart Instant Pot*. You can also make this in a 3 or 8 quart pot.
  • Store leftovers in an airtight container* in the refrigerator for up to 4 days or in the freezer for up to 3 months.
  • Other recipes you can make with spinach are Instant Pot Spinach and Ravioli Lasagna and Instant Pot Spinach Artichoke Dip.
  • Recipe adapted from Nancy’s Chicken Casserole on Umami.
Did you know you can filter the recipes on my website to search by meat type, IP or Crockpot, low carb, gluten free, etc.? Use the filter to find exactly what you are looking for. 

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Instant Pot Mushroom Penne Pasta
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Nancy’s Casserole


5 Stars 4 Stars 3 Stars 2 Stars 1 Star

5 from 2 reviews

  • Author: 365 Days of Slow and Pressure Cooking
  • Prep Time: 20 minutes
  • Cook Time: 5 minutes (plus 5 minute NPR)
  • Total Time: 25 minutes
  • Yield: 4–6 servings 1x
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Ingredients

Scale
  • 4 Tbsp butter, divided
  • 4 ounces quartered mushrooms
  • 1/2 tsp kosher salt
  • 1/2 tsp black pepper
  • 1/2 tsp onion powder
  • 1/2 tsp garlic powder
  • 2 cup chicken broth
  • 8 ounces penne pasta
  • 1 cherry pepper, diced (or half a red bell pepper)
  • 1 pound boneless skinless chicken thighs, cut into bite size pieces
  • 1/2 cup half and half or cream
  • 1 Tbsp cornstarch
  • 1/2 cup shredded parmesan cheese
  • 1 tsp balsamic vinegar
  • 2 cups chopped spinach

Instructions

  1. Turn Instant Pot to saute setting. When display says HOT add in 2 Tbsp of the butter and let it melt. Add in the mushrooms and saute for 5 minutes. Stir in the salt, pepper, onion powder and garlic powder. 
  2. Pour in the broth and scrape the bottom of the pot so that nothing is sticking. Turn off Instant Pot. 
  3. Sprinkle in the penne and pimento. Top evenly with the chicken. Add in the remaining 2 Tbsp of butter.
  4. Cover Instant Pot and secure the lid. Make sure valve is set to sealing. Set the manual/pressure cook button to 4 minutes. When time is up let pot sit for 5 minutes and then move valve to venting. Remove the lid.
  5. Stir in the half and half. In a small bowl stir together 1 Tbsp cornstarch and 1 Tbsp cold water until smooth. Then turn Instant Pot to saute setting. Stir the slurry into the pot to thicken the sauce. Once thickened turn off Instant Pot. Stir in the parmesan, vinegar and spinach.
  6. Serve and enjoy!
  • Category: Pasta
  • Method: Instant Pot

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Instant Pot Mushroom Penne Pasta

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*Karen Petersen is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com.

7 Comments Filed Under: All Recipes, Chicken, Instant Pot, Pasta

Comments

  1. Sharon says

    May 18, 2025 at 9:33 am

    It was good with 3 red mini peppers. Used less butter and added more spices on top of the chicken. Good with protein+ pasta.

    Reply
    • Karen says

      May 20, 2025 at 8:10 pm

      Thanks for the 5 stars Sharon!

      Reply
  2. Terri says

    April 23, 2025 at 4:18 pm

    Great recipe! I tweaked a little bit due to not having mushrooms. I added a package of Gourmet Finishing Sauce – Roasted Poblano Garlic to the broth mixture. Followed your InstaPat directions and then slow cooked it for a couple of hours. Added a bit more half and half, cheese and chopped fresh spinach. Fantastic! Your site is the best!

    Reply
    • Karen says

      May 14, 2025 at 12:41 pm

      your version sounds awesome!

      Reply
  3. Donna says

    April 12, 2025 at 1:36 pm

    could you make this in a slow cooker instead?

    Reply
    • Karen says

      April 18, 2025 at 4:01 pm

      I wouldn’t’ make this one in the slow cooker personally. Pasta doesn’t do great in the crockpot.

      Reply
      • Donna says

        April 18, 2025 at 6:21 pm

        thanks

        Reply

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Welcome!

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Hi, I’m Karen. I know that dinner time can be less than relaxing. Busy schedules and cranky kids and a hundred other things can lead to weariness when it comes to putting dinner on the table. I can help! I make homemade, family-friendly slow cooker and Instant Pot dinners and share the recipes with you.

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