High Protein Chicken Fajita Casserole – A Simple, Satisfying Weeknight Meal
Chicken fajitas are great, but turning them into a baked casserole makes them even easier for busy nights. This version keeps all the smoky, zesty flavor you love and packs in plenty of lean protein. It’s family-friendly, reheats well, and doesn’t require fancy ingredients or extra cookware.
If you like meal prep, this is a winner. If you just want dinner without fuss, it’s that too.
Ingredients
Method
- Preheat and prep. Heat your oven to 400°F (200°C). Lightly grease a 9x13-inch baking dish.
- Slice the chicken and veggies. Cut chicken into thin strips, about 1/2 inch wide. Slice peppers and onion into similar-sized strips so they cook evenly.
- Season. In a large bowl, toss chicken, peppers, and onion with olive oil, fajita seasoning, smoked paprika, chili flakes (if using), and a pinch of salt and pepper. Make sure everything is well coated.
- Make the creamy protein base. In a separate bowl, whisk Greek yogurt, cream cheese, half the shredded cheese, lime juice, garlic, and a pinch of salt. The mixture should be smooth and spreadable.
- Assemble the casserole. Spread half the seasoned chicken and veggies in the baking dish. Dollop and spread half the yogurt mixture over the top. Repeat with the remaining chicken/veggies and the rest of the yogurt mixture. If using black beans or corn, scatter them evenly between the layers.
- Bake covered, then uncovered. Cover loosely with foil and bake for 15 minutes. Remove the foil, sprinkle on the remaining cheese, and bake another 10–15 minutes until the chicken is cooked through (165°F/74°C) and the top is lightly golden.
- Rest and garnish. Let it rest for 5–10 minutes so the juices settle. Top with chopped cilantro and an extra squeeze of lime.
- Serve your way. Spoon into bowls, over cauliflower rice or brown rice, or tuck into warm tortillas. Add salsa or hot sauce if you like more heat.
What Makes This Special
This casserole packs a serious protein punch thanks to chicken breast and a light, creamy binder made with Greek yogurt and a little shredded cheese. You still get the classic fajita flavor—peppers, onions, lime, and warm spices—without juggling a hot skillet at the stove.
It bakes in one dish, so cleanup is easy. And because it’s not heavy on tortillas or rice, it stays balanced while still being filling.
It’s flexible, too. You can swap in low-fat cheese, use dairy-free options, or bump up fiber with black beans. It’s also great for feeding a crowd or portioning into lunches for the week.
Shopping List
- 2 pounds boneless, skinless chicken breasts, thinly sliced
- 3 bell peppers (mix of red, yellow, green), sliced
- 1 large yellow onion, sliced
- 2 tablespoons olive oil
- 1 packet fajita seasoning (or see below for a homemade blend)
- 1 teaspoon smoked paprika (optional, for extra depth)
- 1/2 teaspoon chili flakes (optional, for heat)
- 1 cup plain nonfat Greek yogurt
- 1/2 cup low-fat cream cheese, softened (or Neufchâtel)
- 1 cup reduced-fat shredded Mexican blend or cheddar cheese, divided
- Juice of 1 lime
- 2 cloves garlic, minced
- 1/2 teaspoon salt, plus more to taste
- 1/2 teaspoon black pepper
- Fresh cilantro, chopped (for garnish)
- Optional add-ins: 1 can black beans (drained and rinsed), 1 cup corn kernels
- Optional toppings: salsa, sliced avocado, hot sauce, extra lime wedges
Homemade fajita seasoning (if not using a packet): 2 teaspoons chili powder, 1 teaspoon ground cumin, 1 teaspoon paprika, 1/2 teaspoon garlic powder, 1/2 teaspoon onion powder, 1/2 teaspoon oregano, 1/2 teaspoon salt, 1/4 teaspoon black pepper.
How to Make It
- Preheat and prep. Heat your oven to 400°F (200°C).
Lightly grease a 9×13-inch baking dish.
- Slice the chicken and veggies. Cut chicken into thin strips, about 1/2 inch wide. Slice peppers and onion into similar-sized strips so they cook evenly.
- Season. In a large bowl, toss chicken, peppers, and onion with olive oil, fajita seasoning, smoked paprika, chili flakes (if using), and a pinch of salt and pepper. Make sure everything is well coated.
- Make the creamy protein base. In a separate bowl, whisk Greek yogurt, cream cheese, half the shredded cheese, lime juice, garlic, and a pinch of salt.
The mixture should be smooth and spreadable.
- Assemble the casserole. Spread half the seasoned chicken and veggies in the baking dish. Dollop and spread half the yogurt mixture over the top. Repeat with the remaining chicken/veggies and the rest of the yogurt mixture.
If using black beans or corn, scatter them evenly between the layers.
- Bake covered, then uncovered. Cover loosely with foil and bake for 15 minutes. Remove the foil, sprinkle on the remaining cheese, and bake another 10–15 minutes until the chicken is cooked through (165°F/74°C) and the top is lightly golden.
- Rest and garnish. Let it rest for 5–10 minutes so the juices settle. Top with chopped cilantro and an extra squeeze of lime.
- Serve your way. Spoon into bowls, over cauliflower rice or brown rice, or tuck into warm tortillas.
Add salsa or hot sauce if you like more heat.
Storage Instructions
- Refrigerator: Cool completely, then store in airtight containers for up to 4 days.
- Freezer: Portion into freezer-safe containers and freeze for up to 2 months. Thaw in the fridge overnight before reheating.
- Reheating: Microwave in 60–90 second bursts, stirring between rounds, until hot. Or cover and warm in a 325°F (165°C) oven for 15–20 minutes.
Add a splash of water or broth if it looks dry.
- Meal prep tip: Pack with a wedge of lime and fresh cilantro to brighten it up after reheating.
Benefits of This Recipe
- High protein, satisfying. Lean chicken plus Greek yogurt and a bit of cheese deliver staying power without a heavy carb load.
- Balanced flavor. Smoky spices, lime juice, and garlic hit all the right notes without being overwhelming.
- One-dish convenience. Less cleanup and a straightforward process make it weeknight-friendly.
- Flexible for different diets. Easy to adapt for low-carb, gluten-free, or higher-fiber needs.
- Great for leftovers. Holds up well in the fridge and tastes even better the next day as the flavors meld.
What Not to Do
- Don’t overbake the chicken. Dry chicken sinks the whole dish. Pull it once it hits 165°F in the thickest pieces.
- Don’t skip the lime. The acidity balances the creaminess and brightens the spices.
- Don’t cut the veggies too thick. Large chunks take longer to soften and can throw off the texture.
- Don’t overload with cheese. A mountain of cheese can make it greasy and mask the fajita flavors. Stick to the amounts listed.
- Don’t forget salt. Seasoning the chicken and veggies properly brings everything to life.
Taste and adjust.
Variations You Can Try
- Extra-lean boost: Swap some or all of the cream cheese for more nonfat Greek yogurt. Add 1–2 tablespoons nutritional yeast for a cheesy note without extra fat.
- Dairy-free: Use a thick, unsweetened dairy-free yogurt and your favorite plant-based cheese. Add a splash of unsweetened almond milk if the mixture is too thick.
- Spicy chipotle: Stir 1–2 teaspoons minced chipotle in adobo into the yogurt mixture for smoky heat.
- Southwest beans and corn: Add black beans and corn for fiber and texture.
Season with a pinch more cumin.
- Low-carb tortillas on top: Tear a couple of low-carb tortillas into strips and scatter on top for the last 10 minutes of baking for a chewy, toasty finish.
- Turkey or shrimp: Use turkey breast strips the same way as chicken. For shrimp, add them on top for the last 8–10 minutes only to avoid overcooking.
- Veggie-lover’s version: Add mushrooms or zucchini. Sauté briefly first to release moisture so the casserole doesn’t get watery.
FAQ
How much protein is in a serving?
It varies by brands and add-ins, but a typical serving (about one-sixth of the casserole) lands around 35–45 grams of protein, thanks to the chicken, Greek yogurt, and cheese.
Can I use pre-cooked chicken?
Yes.
Use shredded rotisserie chicken or grilled chicken strips. Toss them with the seasoning and bake for a shorter time—about 15 minutes total—just to heat through and melt the cheese.
Will low-fat dairy make it watery?
Not if you use thick Greek yogurt and softened cream cheese. If your yogurt is loose, strain it for 15–20 minutes in a fine mesh sieve or paper towel-lined colander before mixing.
Can I assemble it ahead?
You can assemble it up to 24 hours in advance.
Cover and refrigerate. Add 5–10 minutes to the bake time since it’ll go into the oven cold.
What should I serve with it?
Keep it simple: a green salad, cilantro-lime cauliflower rice or brown rice, or warm tortillas. Fresh salsa and extra lime wedges make it pop.
How do I make it gluten-free?
Most ingredients are naturally gluten-free.
Just confirm your fajita seasoning and cheese are labeled gluten-free and skip any wheat-based tortillas.
Can I make it in a skillet instead?
Yes. Use an oven-safe skillet. Sauté the chicken and veggies, stir in the creamy mixture, top with cheese, and finish under the broiler for 2–3 minutes until bubbly.
Final Thoughts
This High Protein Chicken Fajita Casserole gives you bold flavor, plenty of protein, and a smart, streamlined method.
It’s unfussy cooking that still feels like a treat. Whether you’re feeding the family or stocking your lunch boxes, it checks all the boxes. Keep the ingredients on hand, and you’ll always have an easy, balanced dinner ready to go.
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