5-Ingredient Slow Cooker Chicken Breast Fajitas

This is the fajita dinner that basically makes itself. Toss chicken, peppers, onion, seasoning, and a can of tomatoes in the Slow Cooker in the morning, and by dinnertime you’ve got tender, shreddable chicken swimming in all that sweet-savory juice — no standing over a hot skillet required. It’s the easiest weeknight dinner I make, and it happens to taste like you tried a lot harder than you did.

Why You’ll Love It

• Just 5 ingredients — nothing fancy or hard to find
• Set it and forget it — no babysitting the stove, the Slow Cooker does all the work
• Shreds itself — two forks, thirty seconds, done
• Tastes even better the next day — leftovers reheat beautifully
• Easy to double — great for feeding a crowd without extra effort

Ingredient Notes

The chicken breasts: I usually buy the big vacuum-sealed pack from Costco because it’s just us being practical about money, but any boneless skinless breast works. Thighs work too, and honestly might be better, though my husband has Opinions about thighs (he thinks they’re “too chickeny,” whatever that means, I’ve stopped arguing).

Bell peppers: Any color, though I lean toward doing at least one red one because the color payoff matters more than people admit. Green peppers are more bitter, so if your kids are picky, maybe go easy on those.

Fajita seasoning: I make my own most of the time because the packets have gotten expensive for what amounts to paprika and cumin, but there’s no shame in the packet. McCormick’s is fine. Nobody at my table has ever known the difference and I’m not going to pretend it’s some big culinary sin to use it.

The canned tomatoes: Undrained, don’t skip that, the juice is doing a lot of the work here in terms of moisture. Fire-roasted if your store has them, regular if not.

Ingredients

• 2 pounds boneless, skinless chicken breasts
• 3 bell peppers, any colors, thinly sliced (I usually eyeball this — sometimes it’s really 2 and a half)
• 1 large yellow onion, thinly sliced
• 3 tablespoons fajita seasoning, store-bought or homemade
• 1 (14.5-ounce) can diced tomatoes, undrained

Instructions

Slice your peppers and onion into strips — try to get them roughly the same thickness, though I’ll be honest, mine are never perfectly even and it’s fine, they all soften up together regardless. Lay them in the bottom of the Slow Cooker in an even-ish layer. This is your little vegetable bed, and it does actual work keeping the chicken from drying out, which I didn’t believe until I saw it happen.

Pat the chicken dry — don’t skip this, wet chicken doesn’t take seasoning well, it just sort of slides off — and then rub the fajita seasoning over both sides. Press it in a little with your fingers. I’ve absentmindedly seasoned only one side before, rushing out the door, and you can tell in the final result, it’s just flatter tasting on that half.

Lay the chicken over the vegetables and pour the whole can of tomatoes, juice and all, right over everything. Don’t drain it — I made that mistake exactly once, thinking I was being tidy, and the whole thing came out drier than I wanted.

Cover it and cook on LOW for 4 to 5 hours (or on HIGH for 2 to 3 hours), depending on what kind of morning you’re having. I default to low most days because I’m usually gone eight, nine hours and I don’t want to worry about it.

When it’s done, the chicken should just fall apart under a fork — pull it out onto a cutting board and shred it, then dump it back into the cooker with everything else and stir it around so it soaks back up some of that liquid. Taste it here. If it’s flat, and sometimes it is, a pinch of salt or another small sprinkle of seasoning wakes it right up. If it seems too thick or gloppy, a splash of water or broth loosens it fine.

Serve it in warm tortillas with whatever you’ve got — avocado, sour cream, cheese, lime. My daughter drowns hers in hot sauce to a degree I find alarming.

Variations

My neighbor Denise does hers with chicken thighs and swears up and down they’re juicier, and she’s probably right, I just haven’t fully committed to switching.

My brother, who fancies himself more of a “real cook” than the rest of us, likes to pull some peppers out before they go soft and quickly sauté a handful fresh right before serving so there’s some crunch mixed in with the soft stuff — which, fine, it’s good, but it’s also an extra pan and extra effort, which somewhat defeats my whole purpose here.

If you want it saucier, a spoonful of salsa stirred in at the end does nice things. And for what it’s worth, I’ve served this over shredded lettuce instead of tortillas when we were all pretending to eat healthier that one January, and it was fine, though nobody was fooled.

Storage & Reheating

It keeps in the fridge four or five days, easy, in whatever container you’ve got with a lid that actually seals — I go through a rotating cast of mismatched Tupperware, half of which are missing their proper lids at any given time.

Reheats well in the microwave, maybe with a splash of water so it doesn’t dry out. I’ve frozen portions before too, though I’ll admit I once found a container shoved in the back that had clearly been there since some point the previous fall, and that’s just a storage tip in the sense that a label helps, which I say as someone who never labels anything.

Last Thoughts

I don’t know that this recipe needs a big finish, honestly. It’s chicken in a pot that turns into dinner. But there’s something about the smell of it filling up the house on a weekday afternoon that still gets me a little, even now that the kids are mostly out of the house and it’s usually just me and my husband eating it at the counter instead of the table, which is its own small thing I haven’t quite worked out how I feel about yet.