A Really Good Patty Melt

Thinly slice a some white onion (Do not chop!!) and finely chop 2 small mushrooms. Saute these in a small amount of canola oil in a heavy frying pan. Fry a large but thin hamburger made of lean ground beef. Toast two slices of butter crust bread and lightly butter both sides. Place one slice of toast on the plate--then the fried onions & mushrooms, add the hamburger, and put some catsup on this. Put a slice of american cheese on top of this, and finally, Top with the other slice of toast. Cut the sandwich diagonally. Heat in microwave for 15 to 20 so the cheese is melted. Enjoy!!!