High Protein Tuscan Chicken Casserole – Comforting, Creamy, and Satisfying

This High Protein Tuscan Chicken Casserole brings together juicy chicken, sun-dried tomatoes, spinach, and a silky, garlicky sauce baked until bubbly. It’s the kind of weeknight dinner that feels special but doesn’t ask much of you in the kitchen. The flavors are warm and familiar: a little sweet from tomatoes, a little rich from the sauce, and bright with herbs.

Best of all, it packs a serious protein punch while staying balanced and wholesome. Serve it with a simple salad or roasted veggies and you’re set.

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High Protein Tuscan Chicken Casserole - Comforting, Creamy, and Satisfying

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Prep Time 15 minutes mins

Cook Time 35 minutes mins

Total Time 50 minutes mins

Servings: 6 servings

Ingredients Method

Ingredients

  

• Chicken: 2 pounds boneless, skinless chicken thighs (or breasts)
• Olive oil: 2 tablespoons
• Onion: 1 medium, diced
• Garlic: 4 cloves, minced
• Sun-dried tomatoes: 1/2 cup, drained and chopped (oil-packed preferred)
• Baby spinach: 5–6 cups (about 5 ounces)
• Cannellini beans: 1 can (15 ounces), drained and rinsed
• Low-sodium chicken broth: 1 cup
• Plain Greek yogurt: 3/4 cup (2% or 5% for best texture)
• Parmesan cheese: 1/2 cup, finely grated
• Mozzarella: 1 cup, shredded (part-skim works well)
• Tomato paste: 1 tablespoon
• Italian seasoning: 2 teaspoons
• Red pepper flakes: 1/4–1/2 teaspoon (optional)
• Fresh basil: Small handful, chopped (or 1 teaspoon dried)
• Kosher salt and black pepper
• Lemon: 1, for zest and juice

Method

 

1. Preheat and prep. Heat your oven to 400°F (200°C). Lightly grease a 9x13-inch baking dish. Pat the chicken dry and season both sides with 1 teaspoon salt, 1/2 teaspoon black pepper, and 1 teaspoon Italian seasoning.
2. Sear the chicken. Warm 1 tablespoon olive oil in a large skillet over medium-high heat. Sear chicken 2–3 minutes per side until lightly golden (it won’t be cooked through). Transfer to a plate.
3. Sauté aromatics. Lower heat to medium. Add remaining 1 tablespoon olive oil, then onion and a pinch of salt. Cook 3–4 minutes until translucent. Stir in garlic for 30 seconds until fragrant.
4. Build the flavor base. Add tomato paste, sun-dried tomatoes, and red pepper flakes. Stir 1 minute to toast. Pour in chicken broth, scraping up any browned bits. Simmer 2 minutes.
5. Wilt the greens and add beans. Stir in spinach until just wilted. Fold in cannellini beans and 1/4 cup Parmesan. Remove the pan from heat.
6. Finish the sauce. In a small bowl, whisk Greek yogurt with a few spoonfuls of the hot broth mixture to temper it. Then stir the yogurt mixture back into the skillet. Add zest of half the lemon and a squeeze of juice. Taste and adjust salt and pepper.
7. Assemble. Pour the mixture into the baking dish. Nestle the seared chicken on top, then sprinkle with remaining Parmesan and the mozzarella.
8. Bake. Bake 18–22 minutes, until the chicken reaches 165°F (74°C) and the top is bubbly and lightly browned.
9. Finish and serve. Let rest 5 minutes. Sprinkle with fresh basil and an extra squeeze of lemon. Serve with a crisp salad, roasted broccoli, or a small side of whole-grain pasta.

What Makes This Special

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This casserole channels classic Tuscan flavors—garlic, basil, sun-dried tomatoes, and olive oil—into a single pan meal that’s big on comfort. The sauce is lightened with Greek yogurt and chicken broth, so you get creaminess without a heavy feel.

Tender chicken thighs hold up beautifully during baking, while white beans and spinach add fiber, texture, and extra protein. It bakes to a golden, fragrant finish that feels like something you’d get at a cozy neighborhood bistro.

In short: high protein, pantry-friendly, crowd-pleasing, and perfect for meal prep.

Shopping List

• Chicken: 2 pounds boneless, skinless chicken thighs (or breasts)
• Olive oil: 2 tablespoons
• Onion: 1 medium, diced
• Garlic: 4 cloves, minced
• Sun-dried tomatoes: 1/2 cup, drained and chopped (oil-packed preferred)
• Baby spinach: 5–6 cups (about 5 ounces)
• Cannellini beans: 1 can (15 ounces), drained and rinsed
• Low-sodium chicken broth: 1 cup
• Plain Greek yogurt: 3/4 cup (2% or 5% for best texture)
• Parmesan cheese: 1/2 cup, finely grated
• Mozzarella: 1 cup, shredded (part-skim works well)
• Tomato paste: 1 tablespoon
• Italian seasoning: 2 teaspoons
• Red pepper flakes: 1/4–1/2 teaspoon (optional)
• Fresh basil: Small handful, chopped (or 1 teaspoon dried)
• Kosher salt and black pepper
• Lemon: 1, for zest and juice

How to Make It

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1. Preheat and prep. Heat your oven to 400°F (200°C). Lightly grease a 9×13-inch baking dish.

   Pat the chicken dry and season both sides with 1 teaspoon salt, 1/2 teaspoon black pepper, and 1 teaspoon Italian seasoning.

2. Sear the chicken. Warm 1 tablespoon olive oil in a large skillet over medium-high heat. Sear chicken 2–3 minutes per side until lightly golden (it won’t be cooked through). Transfer to a plate.
3. Sauté aromatics. Lower heat to medium.

   Add remaining 1 tablespoon olive oil, then onion and a pinch of salt. Cook 3–4 minutes until translucent. Stir in garlic for 30 seconds until fragrant.

4. Build the flavor base. Add tomato paste, sun-dried tomatoes, and red pepper flakes.

   Stir 1 minute to toast. Pour in chicken broth, scraping up any browned bits. Simmer 2 minutes.

5. Wilt the greens and add beans. Stir in spinach until just wilted.

   Fold in cannellini beans and 1/4 cup Parmesan. Remove the pan from heat.

6. Finish the sauce. In a small bowl, whisk Greek yogurt with a few spoonfuls of the hot broth mixture to temper it. Then stir the yogurt mixture back into the skillet.

   Add zest of half the lemon and a squeeze of juice. Taste and adjust salt and pepper.

7. Assemble. Pour the mixture into the baking dish. Nestle the seared chicken on top, then sprinkle with remaining Parmesan and the mozzarella.
8. Bake. Bake 18–22 minutes, until the chicken reaches 165°F (74°C) and the top is bubbly and lightly browned.
9. Finish and serve. Let rest 5 minutes.

   Sprinkle with fresh basil and an extra squeeze of lemon. Serve with a crisp salad, roasted broccoli, or a small side of whole-grain pasta.

Keeping It Fresh

Let the casserole cool to room temperature, then store in airtight containers. It keeps well in the fridge for up to 4 days.

Reheat gently in the oven at 325°F (165°C) or in the microwave at 50–70% power so the sauce doesn’t separate.

For freezing, portion into freezer-safe containers and freeze up to 2 months. Thaw overnight in the fridge, then reheat covered until hot. A splash of broth during reheating brings the sauce back to life.

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Why This is Good for You

• High protein: Chicken thighs, Greek yogurt, mozzarella, and cannellini beans deliver a satisfying protein load to support muscle and satiety.
• Balanced macros: Beans add complex carbs and fiber; spinach and tomatoes bring vitamins A, C, K, and antioxidants like lycopene.
• Lighter creaminess: Using Greek yogurt instead of heavy cream reduces saturated fat while keeping the sauce velvety.
• Sodium-aware: Low-sodium broth and controlled seasoning help manage salt without losing flavor.

Pitfalls to Watch Out For

• Curdled sauce: Add yogurt off the heat and temper it first. High heat can cause it to split.
• Dry chicken: Don’t overbake.

  Pull it when it hits 165°F. Thighs are more forgiving than breasts.

• Watery casserole: Don’t skip wilting the spinach first. It releases water as it cooks.
• Bland results: Taste the sauce before baking.

  Adjust salt, pepper, and lemon to brighten.

• Greasy finish: If sun-dried tomatoes are very oily, blot them or reduce added oil in the pan.

Alternatives

• Chicken swaps: Use boneless, skinless breasts (reduce bake time slightly) or turkey cutlets. For pescatarian, try chunks of cooked white fish stirred in after baking.
• Dairy-free: Replace yogurt with a thick, unsweetened plant-based yogurt and use a dairy-free mozzarella-style shred. Add 1–2 teaspoons nutritional yeast for savory depth.
• Low carb: Skip the beans and add extra spinach or sautéed mushrooms.

  Stir in riced cauliflower for bulk.

• Gluten-free: This recipe is naturally gluten-free; just confirm your broth and sun-dried tomatoes are certified GF.
• Extra veg: Add roasted red peppers, artichoke hearts, or zucchini slices to boost volume and color.
• No yogurt on hand: Use 4 ounces reduced-fat cream cheese whisked with a splash of broth for a similarly creamy effect.

FAQ

Can I make this ahead?

Yes. Assemble the casserole through step 7, cover, and refrigerate up to 24 hours. When ready to cook, add 5–10 extra minutes to the bake time and check for 165°F in the thickest piece of chicken.

What can I use instead of sun-dried tomatoes?

Roasted red peppers or halved cherry tomatoes work well.

If using fresh tomatoes, sauté them longer to concentrate their flavor and reduce extra liquid.

How can I boost the protein even more?

Double the beans or add a can of chickpeas. You can also stir in an extra 1/2 cup of Greek yogurt after baking (off heat) for a richer, higher-protein finish.

Will chicken breasts dry out?

They can if overcooked. If using breasts, sear quickly and bake on the shorter end of the time range.

Consider cutting them into large chunks for even cooking.

What sides pair best?

Simple is best: a lemony arugula salad, roasted asparagus or broccoli, or a scoop of whole-grain pasta or farro. Garlic bread is great if you want extra comfort.

Can I use frozen spinach?

Yes. Thaw and squeeze it very dry, then stir it in with the beans.

You may need less broth since frozen spinach holds more moisture.

How do I avoid a salty casserole?

Use low-sodium broth, taste as you go, and watch the salt in your Parmesan. If it’s already very savory, skip extra salt and rely on lemon for brightness.

Is it spicy?

Only mildly, from the red pepper flakes. Feel free to omit them or add more if you like some heat.

In Conclusion

This High Protein Tuscan Chicken Casserole is the kind of recipe you keep in your back pocket: hearty, colorful, and dependable.

It’s easy to adapt, friendly for meal prep, and delivers big flavor with simple steps. Whether you’re feeding the family or stocking the fridge for the week, this one earns a spot in the regular rotation. Warm, creamy, and bright—it checks every box.

About the Author

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Brandon D

Blogger/Fitness & Wellness Coach

I create quick, healthy, family-friendly recipes that make dinner simple, delicious, and stress-free.