Cheesy Chicken Fajita Casserole

The first time I made this casserole, it was supposed to be regular fajitas, but I was running late for a potluck and threw everything in a baking dish instead. My friend Sarah still talks about that accidental discovery whenever we plan dinner gatherings.

Last winter when my sister was recovering from surgery, I brought this over in the baking dish. She ate it for three days straight and told me it was the only thing that actually tasted good through her recovery medicine haze.

Ingredients

• 3 cups cooked chicken breast: Rotisserie chicken works perfectly here, or bake some breasts ahead of time. I like to shred it for better texture throughout.
• 1 large each of red, green, and yellow bell peppers: Using all three colors makes the casserole beautiful and gives you slightly different flavor notes from each pepper.
• 1 large onion: Sweet onions caramelize beautifully in the oven, adding natural sweetness that balances the spices.
• 2 cups shredded Mexican blend cheese: Do not skip the extra cheese on top, that crust is arguably the best part of the whole dish.
• 1/2 cup sour cream and 4 oz cream cheese: This combination creates the creamy base that holds everything together while adding tang.
• 1 can (10 oz) diced tomatoes with green chilies: Drain them well or your casserole will be too soupy, but dont rinse or you lose all that flavor.
• 1 tsp each chili powder and cumin: These are your fajita power couple, giving you that classic Tex Mex backbone.
• 1/2 tsp smoked paprika: Regular paprika works but smoked adds this incredible depth that makes people ask what your secret ingredient is.
• 1/2 tsp each garlic powder and onion powder: I double these sometimes because that savory punch is what keeps everyone coming back for seconds.
• 1 tbsp olive oil: Helps the vegetables soften and caramelize before they hit the oven.
• Fresh cilantro and green onions: These bright garnishes cut through all that rich cheese and cream.

Instructions

Get your oven ready:

Preheat to 375°F and grease a 9x13 inch dish with butter or cooking spray. Do not skip this step or you will be scrubbing baked on cheese for days.

Sauté the vegetables:

Heat olive oil in a large skillet over medium high heat. Add your sliced peppers and onions, cooking for 6 to 8 minutes until they are soft and starting to caramelize. This step builds so much flavor.

Mix everything together:

In a large bowl, combine the shredded chicken, sautéed vegetables, drained tomatoes, all the spices, cream cheese, and sour cream. Mix until everything is well coated and season with salt and pepper. It will look like a lot of mixture but it settles perfectly in the oven.

Assemble the casserole:

Spread the mixture evenly in your prepared dish. Top with all that shredded Mexican cheese, making sure it covers the surface completely. Every bite should have some cheese.

Bake until golden and bubbly:

Bake uncovered for 25 to 30 minutes. You want the cheese to turn golden brown in spots and the edges to be bubbling up nicely.

Let it rest and garnish:

Wait 5 minutes before serving, this helps the casserole set so you get nice squares instead of a sloppy mess. Top with fresh cilantro and green onions right before serving.

Save to Pinterest

My youngest nephew who claims to hate anything with peppers cleaned his plate and asked if we could have this every Tuesday. Sometimes the best recipes are the ones that surprise the picky eaters in your life.

Make It Your Own

I have made this with leftover turkey after Thanksgiving and it was honestly just as good. The beauty of a casserole is how forgiving it is with substitutions and variations.

Perfect Sides

Warm flour tortillas on the table turn this into an interactive meal. Or keep it simple with a green salad dressed with lime vinaigrette to cut through the richness.

Make Ahead Magic

Assemble everything up to the baking step, cover tightly, and refrigerate for up to 24 hours. You may need to add 5 to 10 minutes to the baking time since it will be cold. This has saved me so many weeknights.

• Freeze unbaked casseroles for up to 3 months
• Thaw overnight in the refrigerator before baking
• Add a foil tent if the top browns too quickly

Save to Pinterest

There is something so satisfying about a one dish meal that brings everyone to the table. Hope this becomes your go to for busy nights and potlucks alike.

Your Recipe Questions Answered

→ Can I use rotisserie chicken?

Yes, rotisserie chicken works perfectly and saves time. Simply shred about 3 cups and add it to the mixture.

→ How spicy is this casserole?

The dish has mild to medium heat from the chili powder and diced tomatoes with green chilies. Adjust the cayenne pepper or add jalapeños for more spice.

→ Can I make this ahead?

Absolutely. Assemble the casserole, cover tightly, and refrigerate for up to 24 hours before baking. You may need to add 5-10 minutes to the baking time.

→ What should I serve with it?

Warm flour or corn tortillas, Spanish rice, refried beans, or a fresh green salad complement this dish beautifully.

→ Can I freeze leftovers?

Yes, portions freeze well for up to 3 months. Thaw overnight in the refrigerator and reheat in the oven or microwave.

→ Can I substitute the meat?

Shredded turkey works well as a substitute. For a vegetarian version, try black beans or a plant-based chicken alternative.