Slice the large onion and bell peppers into thin strips, ensuring uniform thickness.

Heat a large skillet over medium-high heat, then add the lean ground beef and fajita seasoning. Cook for 5-7 minutes until browned.

Remove the beef from the skillet and set aside, allowing it to rest.

In the same skillet, add the sliced onions and bell peppers. Sauté for 4-5 minutes until tender-crisp.

Return the beef to the skillet with the sautéed veggies and reheat for another 1-2 minutes.

Drizzle lime juice and sprinkle dried cilantro over the mixture, stirring to coat.

Warm the tortillas and spoon the beef and veggie mixture onto each tortilla. Serve hot.