1 1/2 pounds boneless beef sirloin steak
3/4 cup Lawry's® Santa Fe Chili with Lime and Garlic Marinade, divided
1 large bell pepper, cored and halved
1 large red onion, cut into 1/4-inch thick slices
1 cup sour cream
12 flour tortillas (6-inch), warmed
Assorted toppings such as salsa, shredded cheese and avocado slices (optional)