Preheat oven 375 degrees.
Flatten 2 pounds of ground beef in a 12 x 17 inch baking sheet that has been sprayed.
Cover the meat well with the Montreal Steak Seasoning, grated onion, and seasoned salt.
Bake 20 to 25 minutes or until the meat is no longer pink.
Remove the meat from the oven and drain the grease.
Add 2 cups of shredded cheddar cheese on the ground beef.
Return to the oven for an additional 10 minutes or until the cheese is melted.
Remove from the oven.
Cut into squares with a knife or pizza cutter.
Add some mustard to the bun and top it with the burger.
Top the burger with a couple of pickles.