Peel and thinly slice the onions.
Heat a large skillet over medium heat. Add a drizzle of olive oil. Once hot (a splash of water sizzles), add onion and toss with oil. Reduce heat to medium low.
While the onions are cooking, julienne the bell peppers. Add to skillet and toss. Continue cooking until peppers are just soft.
While peppers and onions are cooking, thinly slice the steak. Once peppers are soft, add steak to skillet. Add cumin and salt and pepper-to taste. Toss to combine. Increase heat to medium high and cook until the steak is warmed through. Turn off heat and add lime juice.
Serve with warm flour tortillas. Spread tortilla with cream cheese, top with fajita mixture, squeeze a bit of lime, roll up and enjoy!