Low Carb Chicken Fajita Casserole

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This Low Carb Chicken Fajita Casserole is everything you love about fajitas — tender chicken, colorful peppers, creamy cheese, and bold Tex-Mex flavor — all baked into one satisfying dish. It’s quick to make, family-approved, and ideal for busy weeknights.

Whether you’re following a low carb, keto, or gluten-free lifestyle, this easy casserole checks every box. Packed with protein and gooey melted cheese, it’s the kind of dinner everyone looks forward to — even those who aren’t watching their carbs!

Why You’ll Love This Recipe

There’s something irresistible about creamy, cheesy dinners that bring everyone to the table. This Low Carb Chicken Fajita Casserole offers all that comfort without the carbs. It’s flavorful, hearty, and perfect for meal prep — a win for busy families and anyone who wants a fuss-free dinner with fresh, healthy ingredients.

Ingredients for Low Carb Chicken Fajita Casserole

One of the best parts about this easy chicken casserole is how simple the ingredient list is. You only need seven everyday ingredients to create a dish that’s bursting with flavor:

• Chicken Breasts: Cooked and shredded for easy mixing. Rotisserie chicken works great too.
• Coconut Oil (optional): Helps sauté the veggies and adds a touch of healthy fat.
• Bell Peppers: Use any color combo you like — red, yellow, orange, or green. The more color, the more flavor!
• Onion: Adds that signature fajita sweetness and aroma.
• Cream Cheese: Creates a rich, creamy base that binds everything together.
• Taco Seasoning: Brings all the bold Tex-Mex flavor you crave.
• Monterey Jack Cheese: Melts beautifully for that gooey, cheesy top layer.

💡 Tip: Want to kick things up a notch? Add sliced jalapeños, diced green chiles, or a sprinkle of chili flakes for extra spice. You can also mix in toppings like black olives, avocado chunks, or diced tomatoes after baking.

How to Make Your Keto Chicken Fajita Casserole

This recipe comes together in just two dishes — a skillet and a baking pan — which means easy prep and minimal cleanup.

1. Sauté the Veggies:
   Heat your skillet over medium-high heat with a bit of coconut oil. Add the sliced onions and bell peppers and sauté until they’re soft and fragrant.
2. Combine the Filling:
   Remove the skillet from heat. Add in your shredded chicken, softened cream cheese, taco seasoning, and one cup of shredded Monterey Jack. Stir until everything is well combined and creamy.
3. Bake the Casserole:
   Transfer the mixture to a greased 9×13 baking dish. Top with the remaining cheese and bake at 350°F for 25–30 minutes, or until the cheese is melted and bubbly.

Make-Ahead & Meal Prep Tips

If you love prepping meals ahead of time, this recipe is perfect. You can assemble it in advance, cover tightly, and refrigerate for up to 24 hours before baking.

Alternatively, you can skip the skillet step if you’re in a rush — just combine everything directly in the baking dish. Add the cheese halfway through baking to help blend the cream cheese more evenly.

For freezer prep, assemble the unbaked casserole, wrap it tightly, and freeze for up to 3 months. When ready to enjoy, thaw overnight in the fridge and bake as directed.

Crockpot Variation

Want to make it even easier? Turn this recipe into a Crockpot Chicken Fajita Casserole.

Layer the cooked chicken, peppers, onions, cream cheese, seasoning, and cheese in your slow cooker. Cook on low for 2–3 hours or until everything is melted and bubbly. It’s a great hands-off option for busy afternoons — start it before school pickup and come home to a ready dinner!

Serving Ideas for Low Carb Chicken Fajita Casserole

This casserole is so flavorful and versatile that you can serve it in several delicious ways:

• As is: Serve it straight from the oven with a sprinkle of fresh cilantro or a squeeze of lime juice.
• With cauliflower rice: Try it with cilantro-lime cauliflower rice for a low-carb Tex-Mex bowl.
• In wraps: Spoon the filling into low-carb tortillas or lettuce wraps for a fajita-style dinner.
• Over salad: Add a scoop on top of a southwest salad (skip the beans and corn to keep it keto).
• With dips: Pair with avocado salsa, guacamole, or a side of low-carb tortilla chips for a fun twist.

This dish also makes fantastic leftovers — the flavors get even better the next day!

Storing & Reheating Leftovers

If you have leftovers (which might be rare!), here’s how to keep them fresh:

• Refrigerate: Store in an airtight container for up to 5 days.
• Freeze: Freeze portions in freezer-safe containers for up to 3 months.
• Reheat:
  • Microwave: Add a few drops of water to the dish, cover loosely, and heat until warm.
  • Oven: Reheat at 325°F until heated through and cheese is melted again.

Make It Your Own

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This Low Carb Chicken Fajita Casserole is easy to customize. Try one of these ideas next time:

• Use smoked paprika or chipotle seasoning for a smoky kick.
• Replace Monterey Jack with cheddar, mozzarella, or pepper jack for more flavor.
• Add a layer of cauliflower rice or zucchini noodles to make it extra filling.
• Top with sour cream, fresh pico de gallo, or sliced avocado just before serving.

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