Preheat oven to 400 degrees F. Toss the vegetables with half the olive oil, the lime juice, and the salt. Lay on a baking sheet and roast until charred and tender, 25-30 minutes. Remove from oven and let cool slightly.
Heat a skillet over medium heat and add remaining oil and a tortilla. Add a layer of vegetables and the cheese and top with another tortilla. Cook until cheese is melted, carefully flip and continue cooking until both sides are browned. Slide-out of pan and slice into wedges. Serve with the sour cream.