1. Preheat oven to 375°F. In a large bowl, mix oil & taco seasoning. Add beef, onion, peppers & pineapple. Toss to coat.
2. On a foil-wrapped sheet pan spread beef and vegetables evenly. Bake 20 minutes, or until beef is cooked through & vegetables are tender. Wrap tortillas in foil & place in oven 5 minutes to warm.
3. To serve, place beef & vegetables in tortillas. Top with yogurt, cheese & cilantro.