Steps

• In a mixing bowl, combine olive oil, lime juice, and fajita seasoning. Add sliced flank steak to the marinade, ensuring it's well-coated.
• Slice the red and green bell peppers and the onion, aiming for consistency in thickness for even cooking.
• Heat your grill or a stovetop skillet over medium-high heat and cook the marinated steak slices until seared.
• In the same skillet, sauté onions and peppers until softened, seasoning with salt and pepper.
• On a tortilla, layer grilled steak, sautéed vegetables, and cheese, then cook in a skillet until golden brown.