Pin This This slow-cooker casserole layers cubed chicken, onions, garlic, cherry tomatoes and spinach, then bathes everything in a creamy pesto-and-broth mixture. Cook on LOW about 3 hours, stir in refrigerated tortellini, then finish on LOW 45–60 minutes until pasta is tender and cheese melts. Swap in shredded rotisserie chicken to speed prep, try kale for more bite, and finish with extra mozzarella and fresh basil.
The smell of basil and melting cheese drifting through my kitchen on a rainy Tuesday changed my entire attitude about slow cooker meals. I had been skeptical that a casserole could taste this vibrant without an oven, but the creamy pesto sauce proved me wrong in the best way. This dish has since become my go-to for nights when I want something comforting without hovering over the stove.
I made this for my neighbor after she had surgery, and she called me three days later asking for the recipe because her teenagers had devoured the entire batch in one sitting.
Ingredients
- Chicken Breasts: Two large boneless skinless breasts, cubed into bite sized pieces, provide lean protein that stays tender during the slow cook.
- Cheese Tortellini: Refrigerated tortellini holds up better than frozen and absorbs the pesto cream without turning mushy.
- Baby Spinach: Roughly chopped so it wilts evenly into the casserole without clumping.
- Cherry Tomatoes: Halved to release their juices, adding brightness that balances the richness of the cream.
- Heavy Cream: The foundation of the luscious sauce, combined with broth to keep it from being too heavy.
- Basil Pesto: Store bought works perfectly, but homemade pesto will elevate this to something truly special.
- Mozzarella and Parmesan: A blend of both creates the best melt and a golden, bubbly top layer.
Instructions
- Prep the Slow Cooker:
- Lightly grease the inside of your slow cooker with cooking spray or a drizzle of oil so nothing sticks.
- Layer the Chicken:
- Spread the cubed chicken evenly across the bottom and season it generously with salt and pepper so every bite is flavorful.
- Add Aromatics:
- Scatter the chopped onion and minced garlic over the chicken, letting their flavors seep into the meat as everything cooks low and slow.
- Build the Vegetable Layer:
- Arrange the halved cherry tomatoes and chopped spinach on top, distributing them evenly so each serving gets a little color.
- Make the Pesto Cream Sauce:
- Whisk together the heavy cream, chicken broth, and pesto in a bowl until the mixture is smooth and uniformly green.
- Pour and Combine:
- Pour the sauce over all the layered ingredients, then sprinkle in one cup of mozzarella and a quarter cup of Parmesan before giving everything a gentle stir.
- First Cooking Phase:
- Cover and cook on LOW for three hours, letting the chicken become tender and the flavors meld into something aromatic and inviting.
- Add the Tortellini:
- Stir in the refrigerated tortellini, re-cover, and cook on LOW for another 45 minutes to one hour until the pasta is tender and the chicken is cooked through.
- Finish with Cheese:
- Top with the remaining mozzarella and Parmesan, cover for five minutes until melted, and sprinkle with red pepper flakes if you want a gentle kick.
Pin This The moment I lifted the lid and saw that golden cheese stretching over the tortellini, I knew this was not just a weeknight dinner but a recipe I would be asked to bring to every potluck.
Swaps and Shortcuts
Shredded rotisserie chicken cuts the prep time nearly in half if you are in a rush, and sun dried tomato pesto gives the whole dish a deeper, more intense flavor.
What to Serve Alongside
A glass of crisp Sauvignon Blanc and a simple green salad with lemon vinaigrette balance the richness of the casserole beautifully.
Storing and Reheating
This casserole keeps well in the fridge for up to three days and reheats gently in the microwave with a splash of broth to loosen the sauce.
- Store leftovers in an airtight container to maintain freshness.
- Reheat in short intervals, stirring between each, to avoid hot spots.
- Always check that reheated chicken reaches a safe internal temperature before serving.
Pin This Some meals simply make the house feel like home, and this cheesy, pesto scented casserole does exactly that every single time.
Questions & Answers
- → How do I prevent the tortellini from getting mushy?
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Stir refrigerated tortellini into the slow cooker in the final 45–60 minutes of cooking and keep the heat on LOW. Check for tender-but-firm pasta; fresh or frozen tortellini may need slightly less time.
- → Can I use precooked or rotisserie chicken?
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Yes—shredded rotisserie or pre-cooked chicken cuts prep time. Add it at the start so it warms through and absorbs the sauce without overcooking.
- → Is homemade pesto a good swap for store-bought?
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Absolutely—homemade basil pesto brightens the dish. Taste for salt and oil levels, and consider sun-dried tomato pesto for a richer, tangy variation.
- → What cheeses give the best results?
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Shredded mozzarella provides gooey meltiness while grated Parmesan adds savory depth. Use a combination for creamy texture and pronounced flavor.
- → Can I make this without a slow cooker?
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Yes—simmer chicken, aromatics and sauce on the stovetop until the chicken is cooked, then stir in tortellini and cover until tender. Alternatively bake in a covered Dutch oven at 350°F until pasta is done.
- → How should leftovers be stored and reheated?
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Cool to room temperature, refrigerate in an airtight container for up to 3 days. Reheat gently on low heat or in the oven with a splash of broth or cream to restore creaminess.
