Spray the inside of a large, oval slow cooker crock with pan spray.
Pour in about ½ inch of broth. This amount will vary from one cooker to
another. Use more if desired.
Add the sliced onions and two teaspoons of All Purpose Greek Seasoning. Stir to combine.
Sprinkle ½ teaspoon of All Purpose Greek Seasoning on each side of the top round steak. Place the steak on top of the onion mixture in the slow cooker.
Cook on high for 4 hours or low for 7 hours. Times may vary based on individual slow cookers.