Table of Contents
Description
This Keto Fajita Chicken Casserole is cheesy, low-carb, and packed with bold fajita flavors — an easy, healthy dinner the whole family will love!
Introduction
If you’re craving bold Tex-Mex flavors but want to stay on track with your low-carb lifestyle, this Keto Fajita Chicken Casserole is about to become your new favorite dinner. 🌶️🧀 It’s warm, cheesy, satisfying, and loaded with tender chicken, colorful peppers, and smoky fajita seasoning — all baked together in one comforting dish.
This recipe is perfect for busy weeknights when you want something easy, healthy, and totally keto-friendly without spending hours in the kitchen. I love casseroles because they feel like a cozy hug after a long day, and this one delivers that comfort without the carbs or sugar. Plus, everything bakes in one dish, which means fewer dishes and more time to relax.
Whether you’re meal prepping for the week, feeding a hungry family, or just looking for a low-carb dinner recipe that doesn’t feel like “diet food,” this casserole checks every box. It’s rich, flavorful, naturally gluten-free, and endlessly customizable — exactly what a great keto recipe should be.
Recipe Equipment
To make this easy keto casserole, you’ll need just a few kitchen staples:
- 9×13-inch baking dish
- Large skillet
- Cutting board
- Sharp knife
- Mixing spoon or spatula
- Measuring cups and spoons
Recipe Stat Sheet (Quick Overview)
| Category | Details |
|---|---|
| Recipe Name | Keto Fajita Chicken Casserole |
| Cuisine | American / Tex-Mex |
| Diet | Keto, Low-Carb, Gluten-Free |
| Prep Time | 10 minutes |
| Cook Time | 30 minutes |
| Total Time | 40 minutes |
| Servings | 6 |
| Difficulty | Easy |
Ingredients
- 2 lbs boneless, skinless chicken breast, sliced
- 2 tbsp olive oil
- 1 large bell pepper (red), sliced
- 1 large bell pepper (green), sliced
- 1 medium onion, thinly sliced
- 2 tbsp keto-friendly fajita seasoning (sugar-free)
- 1 tsp garlic powder
- 1 tsp smoked paprika
- ½ tsp cumin
- Salt and black pepper, to taste
- 1 cup heavy cream
- 1 cup shredded cheddar cheese
- 1 cup shredded mozzarella cheese
- Optional garnish: fresh cilantro or sliced jalapeños
Why These Ingredients Work
Chicken provides lean protein, while peppers and onions add flavor and color without adding many carbs. Full-fat dairy keeps the casserole creamy and keto-approved.
Ingredient Notes
- Chicken: Chicken thighs can be used for extra juiciness and flavor.
- Fajita Seasoning: Always check labels to ensure it’s sugar-free and low-carb.
- Cheese: Use freshly shredded cheese for the best melt and texture.
- Vegetables: Stick to bell peppers and onions for authentic fajita flavor while keeping carbs low.
Step-by-Step Instructions
Step 1: Preheat and Prep
Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish and set it aside.
Step 2: Cook the Chicken
Heat olive oil in a large skillet over medium heat. Add the sliced chicken, season with salt and pepper, and cook until lightly golden and just cooked through. Remove from the skillet and set aside.
Step 3: Sauté the Veggies
In the same skillet, add sliced bell peppers and onions. Sauté until tender-crisp and fragrant, about 4–5 minutes. The colors should be vibrant, and the aroma irresistible.
Step 4: Season Everything
Return the chicken to the skillet. Add fajita seasoning, garlic powder, smoked paprika, and cumin. Stir well until everything is evenly coated in warm, smoky spices.
Step 5: Make It Creamy
Pour in the heavy cream and gently stir. Let it simmer for 2–3 minutes until slightly thickened and creamy.
Step 6: Assemble the Casserole
Transfer the mixture to your prepared baking dish. Sprinkle cheddar and mozzarella evenly over the top.
Step 7: Bake to Perfection
Bake uncovered for 20–25 minutes, until the cheese is bubbly, melted, and lightly golden around the edges.
Step 8: Rest and Serve
Let the casserole rest for 5 minutes before serving. Garnish with fresh cilantro or jalapeños for extra flair.
Pro Tips & Variations
- Spicy Version: Add crushed red pepper flakes or diced jalapeños.
- Extra Creamy: Mix cream cheese into the sauce for added richness.
- Meal Prep Friendly: Divide into portions for grab-and-go lunches.
- Dairy-Free Option: Use coconut cream and dairy-free cheese.
- Low-Carb Taco Night: Serve over cauliflower rice or shredded lettuce.
This casserole stores beautifully and tastes even better the next day!
Serving Suggestions
- Serve over cauliflower rice for a classic fajita bowl
- Pair with a simple avocado salad 🥑
- Spoon into low-carb tortillas for keto fajita wraps
- Top with sour cream or guacamole for extra indulgence
Storage Information
- Refrigerator: Store leftovers in an airtight container for up to 4 days.
- Freezer: Freeze for up to 2 months (cheese texture may slightly change).
- Reheating: Warm in the oven at 350°F or microwave until heated through.
Nutrition Facts (Per Serving – Estimated)
- Calories: ~420
- Net Carbs: 5g
- Fat: 28g
- Protein: 35g
(Nutrition may vary depending on ingredients used.)
This Keto Fajita Chicken Casserole is proof that low-carb dinners can be bold, comforting, and incredibly satisfying. It’s easy enough for weeknights, delicious enough for guests, and flexible enough to fit your keto lifestyle without stress.
Give this cheesy, flavor-packed casserole a try and let me know how it turned out! 💬 Don’t forget to share it with friends and save it for your next healthy dinner idea.