Preheat your Blackstone griddle grill to medium-high heat.
In a bowl, combine chicken slices, bell peppers, onion, olive oil, chili powder, cumin, garlic powder, salt, and pepper.
Spread the mixture evenly on the griddle and cook for 8-10 minutes, stirring occasionally, until the chicken is cooked through and the vegetables are tender.
Serve the chicken fajitas hot with your favorite low-carb tortillas or lettuce wraps.
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