DO-AHEAD TIP: Marinate steak overnight or for at least 8 hours (see recipe).
Season turkey strips with chili powder, oregano, cumin and salt.
Heat the oil in a skillet over medium-high heat; add turkey strips and stir-fry for 5 to 7 minutes or until done.
Meanwhile, arrange spinach on dinner plates, top with diced avocado, red onion rings and orange quarters.
Spoon hot turkey on top and serve immediately.