Steak and Cheese Sandwiches with Onions and Mushrooms

thin cut beef round sandwich steaks

large onion, sliced into rings

olive oil

sliced mushrooms

seconds cooking spray (I like Smart Balance)

garlic powder

salt and fresh cracked pepper

French bread or baguette, cut into 4 pieces (see tip)

slices reduced-fat cheese slices (I used Sargento provolone)