Steak, Mushroom, and Spinach Skillet

• 1 yellow onion
•  1 lb top sirloin steak, sliced into strips
•  ½ tsp garlic powder
•  4 sprays cooking spray
•  ¼ cup olive oil
•  6 cups spinach
•  4 cups white mushrooms, pre-sliced

1.  Thinly slice onion into rings
2. In a skillet, brown the sirloin in the oil and spray
3. Toss in the onions and mushrooms and saute the meat with the spices in the skillet
4. Add in the spinach at the last minute
5. Serve hot