I started making this dish on weeknights when I wanted something quick, filling, and flexible enough to hit sensible macros without feeling like cardboard. It comes together in one skillet after the pasta is cooked, and the fajita seasoning gives bright, familiar flavor while the Mexican-style cheese makes everything feel indulgent. It’s straightforward comfort food that’s easy to portion and scale.
No need for complicated technique. The ingredients are common, the steps are logical, and the tweaks are small if you need more protein, less fat, or a gluten-free swap. If you like fajitas and cheesy pasta, this combines both in a way that’s practical for meal prep and weeknight dinners.
Ingredients at a Glance
- 8 oz shell pasta (1/2 pound) — pasta carries the sauce and provides the carbohydrate base; shells trap bits of chicken and veggies.
- 1 cup red onion, sliced thin — adds sweetness and texture; slice thin so it softens during the quick sauté.
- 1/2 green bell pepper, deseeded and sliced — classic fajita pepper; keeps the dish colorful and adds volume for minimal calories.
- 1/2 red bell pepper, deseeded and sliced — sweet counterpoint to the green pepper; cook until just tender for bite.
- 14.5 oz petite diced tomatoes, 1 can — provides acidity and a little liquid to help the sauce; keeps the flavors bright.
- 1 pound precooked boneless skinless chicken breast — shredded or chopped; fast source of lean protein. (I used white meat rotisserie chicken with skin and bones removed.)
- 1 packet fajita seasoning (1/4 cup) — the seasoning packet is the main flavor driver; use a low-sodium version if watching salt.
- 1 tablespoon all-purpose flour — thickens the sauce when whisked into broth; measure to ensure the right sauce texture.
- 1 cup chicken broth — thins and flavors the sauce; use low-sodium if you’re controlling salt.
- 2/3 cup Mexican-style blend cheese, grated — melts into the sauce for creaminess and that cheesy finish.
- salt & pepper — to taste; adjust at the end after tasting because the broth and seasoning packet add salt.
Macro Friendly Cheesy Fajita Pasta: Step-by-Step Guide
- Bring a large pot of salted water to a boil. Add 8 oz shell pasta (1/2 pound) and cook according to box directions until al dente. Drain and set aside.
- While the pasta cooks, heat a large, deep-sided skillet over medium heat. Add 1 cup thinly sliced red onion, 1/2 green bell pepper (deseeded and sliced), and 1/2 red bell pepper (deseeded and sliced). Cook, stirring occasionally, until the onions are mostly tender, about 5 minutes.
- Stir in 14.5 oz can petite diced tomatoes (with their juices), 1 pound precooked boneless skinless chicken breast (shredded or chopped), and 1 packet fajita seasoning (1/4 cup). Cook 2–3 minutes, until the chicken is heated through and the seasoning is distributed.
- In a small bowl, whisk 1 tablespoon all-purpose flour into 1 cup chicken broth until the mixture is smooth and lump-free.
- Pour the flour-and-broth mixture into the skillet with the vegetables and chicken. Bring to a gentle boil, stirring frequently, and cook until the sauce thickens slightly, about 2 minutes.
- Add the drained pasta and 2/3 cup grated Mexican-style blend cheese to the skillet. Stir until the pasta is evenly coated and the cheese is melted, about 1–2 minutes.
- Taste and adjust with salt and pepper as desired. Divide into four even portions and serve.
Why This Recipe Works
It’s a balance of texture, flavor, and convenience. The shells hold sauce and pieces of chicken so every bite is cohesive. Precooked chicken shortens active cooking time and keeps the focus on building flavor rather than cooking protein. The fajita seasoning brings a strong, recognizable profile so you don’t need multiple spices or long simmering.
The flour-plus-broth method creates a lightly thickened sauce that clings to pasta without becoming gummy. A modest amount of cheese adds creaminess and mouthfeel rather than turning this into a heavy mac-and-cheese. Portioning into four servings makes this easy to track for macros or meal prep.
International Equivalents
- Pasta: 8 oz shell pasta = about 225 grams.
- Chicken: 1 pound precooked chicken = about 450 grams.
- Tomatoes: 14.5 oz can = about 411 grams.
- Chicken broth: 1 cup = 240 ml.
- Cheese: 2/3 cup grated = about 65–75 grams depending on the blend.
- Flour: 1 tablespoon = about 8–9 grams.
Must-Have Equipment
- Large pot — for boiling the pasta; choose one big enough for water to circulate so pasta cooks evenly.
- Large, deep-sided skillet — a 12-inch skillet or sauté pan works well to hold the veggies, chicken, sauce, and pasta together.
- Colander — to drain the pasta quickly and efficiently.
- Whisk and small bowl — for blending the flour into the chicken broth so you don’t get lumps in the sauce.
- Spoon or spatula — a heatproof turner works best for stirring without tearing the pasta.
Things That Go Wrong
- Sauce too thin: If you skip whisking the flour into cold broth first, you’ll get lumps instead of a smooth slurry. Also, make sure to bring the sauce to a gentle boil for a couple of minutes to activate the flour’s thickening.
- Pasta mushy: Overcooking the shells will make the final dish soggy. Cook to al dente, drain, and toss into the skillet immediately so the pasta finishes in the sauce rather than soaking it up.
- Chicken dry or rubbery: Using stale or overcooked precooked chicken can result in dry pieces. Since the recipe uses precooked chicken, just heat it briefly—2–3 minutes—so it warms through without breaking down.
- Too salty: Seasoning packets and broth can both be high in sodium. Taste before adding extra salt, and use low-sodium broth or a reduced-salt seasoning packet if needed.
Customize for Your Needs
Protein
- Keep it lean: Stick with boneless skinless chicken breast as written for lower fat and high protein.
- Higher fat or flavor: Swap in cooked shredded chicken thigh or diced rotisserie dark meat if you prefer more richness—portion sizes will change the macro profile.
Vegetables
- More volume: Add sliced mushrooms, zucchini, or more bell peppers. These add fiber and volume with little extra calories.
- Greens: Stir in baby spinach at the end so it wilts into the sauce without requiring more cooking time.
Carb and dietary swaps
- Lower carb: Use a chickpea or legume-based pasta or konjac-based pasta to lower net carbs—cook according to package directions.
- Gluten-free: Substitute a certified gluten-free pasta and use a gluten-free flour or cornstarch slurry instead of all-purpose flour.
Behind-the-Scenes Notes
I keep a container of shredded precooked chicken in the fridge for nights like this. It’s a small time-saver that makes the whole dinner approachable after a long day. When I make this for meal prep, I cook the pasta just shy of al dente so it doesn’t soften too much while stored.
The choice of cheese matters: a Mexican-style blend melts well and provides a slightly tangy, peppered profile that complements fajita seasoning. If you want to shave calories, reduce the cheese by a couple of tablespoons and add a squeeze of lime or a sprinkle of fresh cilantro when serving to brighten flavors.
How to Store & Reheat
- Refrigerate: Store in an airtight container for up to 3–4 days. Divide into portions immediately so you can track macros and reheat evenly.
- Freeze: This dish can be frozen, but texture changes occur with the pasta. Freeze in single portions for up to 2 months. Thaw overnight in the fridge before reheating.
- Reheat: Microwave on medium power in 30–45 second intervals, stirring between bursts to distribute heat. On the stove, reheat gently in a skillet with a splash of chicken broth or water to loosen the sauce and prevent drying.
Helpful Q&A
- Can I use raw chicken instead of precooked? Yes, but you’ll need to cook it first: dice or thinly slice raw chicken and sauté until fully cooked before adding the tomatoes and seasoning. Adjust timing accordingly.
- Is the fajita seasoning packet necessary? It simplifies flavoring and keeps the recipe quick. If you prefer, substitute your own blend of chili powder, cumin, smoked paprika, garlic powder, onion powder, and a pinch of cayenne—though that does introduce additional ingredients you’ll have to measure.
- How can I make it lower calorie? Reduce the cheese, increase the vegetables, use a lower-calorie pasta substitute, and choose low-sodium broth to manage both fat and sodium.
- Can I skip the flour? You can, but the sauce will be looser. A cornstarch slurry (mixed cold with water) or reducing the broth over a bit longer are alternatives if you want a thicker finish without all-purpose flour.
Serve & Enjoy
Portion into four equal servings and garnish simply: a squeeze of lime, a few chopped cilantro leaves, or a light sprinkle of extra cheese for those who want it. Serve with a side salad or steamed greens to add fiber and color to the plate.
This is a reliable weeknight formula—lean protein, colorful veggies, and a cheesy, comforting finish that still fits into macro tracking when portioned. It’s practical, forgiving, and quick. Make it your own and keep it in the rotation.
Macro Friendly Cheesy Fajita Pasta
Ingredients
Ingredients
- 8 ozshell pasta1/2 pound
- 1 cupred onionsliced thin
- 1/2 green bell pepperdeseeded and sliced
- 1/2 red bell pepperdeseeded and sliced
- 14.5 ozpetite diced tomatoes1 can
- 1 poundprecooked boneless skinless chicken breastI used white meat rotisserie chicken with skin and bones removed
- 1 packetfajita seasoning1/4 cup
- 1 tablespoonall purpose flour
- 1 cupchicken broth
- 2/3 cupmexican style blend cheesegrated
- salt & pepperto taste
Instructions
Instructions
- Bring a large pot of salted water to a boil. Add 8 oz shell pasta (1/2 pound) and cook according to box directions until al dente. Drain and set aside.
- While the pasta cooks, heat a large, deep-sided skillet over medium heat. Add 1 cup thinly sliced red onion, 1/2 green bell pepper (deseeded and sliced), and 1/2 red bell pepper (deseeded and sliced). Cook, stirring occasionally, until the onions are mostly tender, about 5 minutes.
- Stir in 14.5 oz can petite diced tomatoes (with their juices), 1 pound precooked boneless skinless chicken breast (shredded or chopped), and 1 packet fajita seasoning (1/4 cup). Cook 2–3 minutes, until the chicken is heated through and the seasoning is distributed.
- In a small bowl, whisk 1 tablespoon all-purpose flour into 1 cup chicken broth until the mixture is smooth and lump-free.
- Pour the flour-and-broth mixture into the skillet with the vegetables and chicken. Bring to a gentle boil, stirring frequently, and cook until the sauce thickens slightly, about 2 minutes.
- Add the drained pasta and 2/3 cup grated Mexican-style blend cheese to the skillet. Stir until the pasta is evenly coated and the cheese is melted, about 1–2 minutes.
- Taste and adjust with salt and pepper as desired. Divide into four even portions and serve.
Equipment
- Large Pot
- large deep-sided skillet
- Small Bowl
- Whisk
- Colander
Notes
The more accurate macros for 1 serving (1/4 of this recipe) are as follows: 457 calories, 8.7g F/58.7g C/37g P.
