Prepare the cilantro cream sauce: combine sour cream, cilantro, 1 Tbsp. lime juice and the zest from one lime; set aside.
Cut frozen steaks into 1-inch strips, sprinkle with Mexican seasoning and cook as directed on package; set aside.
Using a stovetop grill pan prepared with cooking spray, grill peppers and onions. Brush open halves of avocados with olive oil and place cut side down on grill; cook 5 minutes.
Remove from grill, carefully remove skins from avocados; cut in slices.
Top each tortilla with steak, grilled vegetables and avocado slices. Drizzle with fresh lime juice, top with cilantro cream sauce, wrap and serve.