Incredible Caramelized Onion Spinach Chicken Pasta Bake

Incredible caramelized onion spinach chicken pasta bake made with two full bags of spinach for extra veggies and a creamy, lightened up parmesan cheese sauce. This protein-packed, healthy chicken pasta bake is the perfect weeknight dinner when you’re craving something warm and comforting!

Prep Time
30 mins
Cook Time
45 mins
Total Time
1 hour 5 mins

Let me tell you about a very special pasta that I recently introduced into my life and has somehow managed to become one of our all time favorite dinners to whip up. It’s full of gorgeous shell pasta, tender chicken breast, sweet caramelized onions and nutritious spinach that somehow melts perfectly into a creamy, yet light parmesan cheese sauce.

Yes, you absolutely must meet my new bff: this one pot incredible caramelized onion spinach chicken pasta bake. Also known as heaven on earth.

It’s creamy, slightly sweet thanks to those juicy caramelized browned onions, packed with protein and has some pretty awesome lick-your-plate-clean kinda magic flavors happening. I swear I could bathe in the parmesan cheese sauce that soaks up the brown bits at the bottom of the pan from the caramelized onions and chicken.

Just trust your friendly neighborhood blogger and put this one on your menu ASAP.

healthy spinach chicken pasta bake on two plates

Ingredients in this creamy spinach chicken pasta bake

Some of my best recipes come to me when I’m peeking around in my fridge, trying to figure out what to make to use up ingredients without going to the store. This healthy spinach chicken pasta bake is no different and is made with simple ingredients that you might already have on-hand.

Admittedly I was feeling seriously inspired by the parmesan sauce in my healthier tuna noodle casserole, and when I found two bags of spinach that needed to be used up, an onion lurking in the pantry and some parmesan, I knew magic was about to be made. Trust me, you’re going to fall in LOVE with this pasta and be amazed at how easy and delicious it was. Here are the ingredients you need:

  • Pasta: I love shells in this recipe but you can use any pasta you’d like — including gluten free!
  • Boneless skinless chicken breast: chicken thighs will also work or you could throw in some chickpeas to keep this vegetarian.
  • Garlic powder, salt and pepper: the only seasonings you’ll need to give this recipe the perfect flavor. You could also add a kick of heat with red pepper flakes if you’re feeling a little wild!
  • Spinach: the spinach will seem like it’s a lot, but it cooks down a ton and is perfect mixed in with the pasta and sauce.
  • Onions: caramelize these babies!
  • Butter: for cooking your chicken and onions and for making the lightened up parmesan cheese sauce.
  • Flour: feel free to use all purpose, whole wheat or gluten free flour for the cheese sauce.
  • Unsweetened almond milk: you can use any milk you’d like for the sauce, too, but
  • Parmesan cheese: you’ll just need a bit of grated parmesan to make the sauce creamy and delicious.
  • Breadcrumbs: for the toasty breadcrumb topping. Feel free to use gluten free breadcrumbs!

Feel free to make this healthy chicken pasta bake your own! I think this recipe would be delicious with mushrooms, peas, broccoli and even sun dried or regular tomatoes.

creamy spinach chicken pasta bake in a pot

How to caramelize onions

  1. Add in ½ tablespoon olive oil or butter, sliced onions and salt and pepper to a large pot and place over medium heat; stir to coat.
  2. Cook onions, stirring occasionally; check your onions every 5-10 minutes until they have completely caramelized and turned golden brown.
  3. If the onions appear to be getting too dark or sticking too much to the bottom of the pan, then simply reduce the heat a bit. You can also add in a teaspoon or two of water.

caramelizing onions for a creamy chicken spinach pasta bake

How to make dairy free spinach chicken pasta bake

If you want to make this chicken pasta bake dairy free, I suggest using vegan butter, a dairy free milk of choice (like the almond milk listed) and dairy free parmesan cheese.

How to make gluten free chicken pasta bake

This healthy chicken pasta bake can easily be made gluten free! Just make sure to use gluten free pasta noodles, a gluten free all purpose flour and gluten free breadcrumbs (or substitute crushed up gluten free tortilla chips, potato chips or crackers).

creamy chicken spinach pasta bake in a pan

Make ahead healthy spinach chicken pasta bake

  1. Prep it ahead of time: feel free to make this chicken pasta bake ahead of time and bake it a day or two later! Simply make the recipe as directed, except do not add the breadcrumbs. Instead, cover with foil and place in fridge until ready to bake. Once ready to bake, add the breadcrumbs as directed and bake. You make need to add 5-10 minutes of extra baking time.
  2. Freezer friendly option: if you want to make this chicken pasta bake ahead of time, simply make the recipe as directed, except do not bake it with the breadcrumbs on top. Instead, put it in a freezer-safe container pan like these, cover and place in a freezer safe bag until you’re ready to bake. Once ready to bake, thaw out the chicken pasta bake in the refrigerator overnight. Once thawed, bake as directed!

healthy spinach chicken pasta bake on a plate

More easy pasta recipes to try

Easy Vegan Mac and Cheese

Spinach Garlic Parmesan Orzo with Crispy Bacon

Date Night In Cilantro Pistachio Pesto Shrimp Pasta

Roasted Veggie Mediterranean Pasta with Goat Cheese

20 Minute Garlic Parmesan Rigatoni with Chicken Sausage & Broccoli

See how to make the spinach chicken pasta bake recipe:

I know you’re going to LOVE this spinach chicken pasta! Be sure to leave a comment and rate the recipe below if you make it. Thanks for being here — I appreciate you! xo.

Incredible Caramelized Onion Spinach Chicken Pasta Bake

5 from 24 votes
spinach chicken pasta bake on a plate
Course Dinner, Gluten Free, Nut Free
Cuisine Italian
Keyword chicken pasta bake recipe, healthy chicken pasta bake, spinach chicken pasta bake
Prep Time 30 minutes
Cook Time 45 minutes
Total Time 1 hour 15 minutes
Serves 6

Incredible caramelized onion spinach chicken pasta bake made with two full bags of spinach for extra veggies and a creamy, lightened up parmesan cheese sauce. This protein-packed, healthy chicken pasta bake is the perfect weeknight dinner when you're craving something warm and comforting!

Ingredients

  • For the pasta:
  • 10 ounces dry pasta shells (or use rotini, fusilli, or whatever pasta you’d like -- even gluten free!)
  • For the chicken:
  • 1 tablespoon olive oil
  • 1 pound boneless skinless chicken breast, diced into ½ inch cubes
  • ½ teaspoon garlic powder
  • Freshly ground salt and pepper
  • For the caramelized onions & spinach:
  • ½ tablespoon olive oil (or butter)
  • 1 very large (or 2 medium) yellow onions, sliced
  • Freshly ground salt and pepper
  • 10-12 ounces fresh spinach
  • For the parmesan cheese sauce:
  • 2 tablespoons butter
  • 1/4 cup all purpose flour (or whole wheat flour or all purpose gluten free flour)
  • 1 3/4 cup unsweetened almond milk (or cashew milk or regular milk)
  • ½ cup grated parmesan cheese
  • ¾ teaspoon salt
  • ½ teaspoon garlic powder
  • Freshly ground black pepper
  • For the topping:
  • 1/2 cup breadcrumbs, gluten free if desired
  • 1 tablespoon butter

Instructions

  1. Preheat your oven to 350 degrees Spray a 2-quart baking dish or 9x9 inch or 11x7 inch baking pan with nonstick cooking spray, or grease with olive oil or butter.
  2. Boil the noodles until al dente, according to the directions on the package. Once done cooking, drain and set aside.
  3. Cook your chicken: add ½ tablespoon olive oil to a large pot and place over medium high heat. Add in diced chicken, season with garlic powder and salt and pepper; cook for 5-7 minutes or until chicken is no longer pink. Transfer chicken to a large bowl once done cooking.
  4. In the same pot you cooked chicken, you can caramelize your onions: add in ½ tablespoon olive oil or butter, onions and salt and pepper; stir to coat. Cook onions, stirring occasionally; check your onions every 5-10 minutes until they have completely caramelized and turned golden brown. If the onions appear to be getting too dark or sticking too much to the bottom of the pan, then simply reduce the heat a bit. You can also add in a few teaspoons of water to help deglaze the pan. Once the onions have caramelized, reduce heat to low and stir in spinach with the onions; cook until spinach wilts. Remove from heat and transfer to the bowl with the chicken.

  5. In the same pot, add in 2 tablespoons of butter and place over medium heat. Once butter is melted, whisk in a little bit of the flour and then slowly add in milk, a little bit at a time, alternating with the flour and vigorously whisking away any lumps. Bring mixture to a boil, then reduce heat to a simmer and stir every so often, until the sauce thickens up.
  6. Once sauce has thickened up a bit, turn off the heat and stir in garlic powder, parmesan cheese. salt and LOTS of freshly ground black pepper.
  7. Next stir in cooked noodles, spinach and caramelized onions and chicken. Season again with salt and pepper, to taste. Pour mixture into your prepared baking pan and spread out.
  8. In a small bowl, mix breadcrumbs with melted butter. Sprinkle breadcrumb mixture on top of casserole and bake for 25 minutes or until breadcrumbs are golden brown. Serves 6.

Recipe Notes

If you prefer, you can skip the breadcrumbs and the baking of the pasta. We do this often when we want to eat quicker and it's still just as delicious! Feel free to crumble crackers on top if you'd still like a little buttery crunch.

Freezer friendly option: simply make the recipe as directed, except do not bake it with the breadcrumbs on top. Instead, put it in a freezer-safe container pan like these, cover and place in a freezer safe bag until you’re ready to bake. Once ready to bake, thaw out the chicken pasta bake in the refrigerator overnight. Once thawed, bake as directed!

Nutrition
Servings: 6 servings
Serving size: 1 serving (based on 6)
Calories: 434kcal
Fat: 15.5g
Saturated fat: 6g
Carbohydrates: 50.4g
Fiber: 3.9g
Sugar: 3.5g
Protein: 27.4g

Recipe by: Monique Volz // Ambitious Kitchen | Photography by: Eat Love Eats

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spinach chicken pasta bake on a plate

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