Kay's Conglomerate Burgers

There used to be a restaurant in our town that had delicious gourmet foods.  Everything was homemade and so wonderful.  Time after time, though, my husband would peruse the menu and then order Mike's Conglomerate Burger.  Mike was the owner and had come up with a delicious hamburger with yummy stuff on it.  Since  my husband liked it so much, I started making it, and over the years, it has evolved into the recipe I'm giving you.  But you could put whatever you please on yours and make it your own Conglomerate Burger.

Kay's Conglomerate Burger
This will make three burgers.
3 hamburger patties
Montreal Steak Seasoning
3 slices cheddar cheese
3 buns ( I like Costco's Torta bread)
butter and garlic seasoning
1 tomato, sliced
1 avocado, sliced
About 10 button mushrooms or even better, portabellas, sliced
1/2 onion, chopped and caramelized
About 1/3 cup bacon crumbles (optional)
olive oil

Sprinkle the patties with a little Montreal Steak Seasoning.  In a skillet on medium heat,  heat some olive oil.  When hot, put the patties in and let cook a nice, long time. When side is nice and brown, turn over and cook a nice, long time.  When the burger is almost done, put a cheese slice on each pattie.  Cover with a lid and turn off the heat.  The burger is done when the cheese is melted.  While the patties are cooking, put the onions in a skillet with some oil or butter and cook on med. heat, stirring frequently until they are golden.  Add the mushrooms.   Cook until soft.  Sprinkle in the bacon crumbles and stir together.
Spread the split bread or buns with butter and garlic seasoning and broil until browned.  Layer the pattie, mushroom mixture, avocado slices and tomato slices on the warm bun. You can add mayo, lettuce pickles, ketchup, mustard, and barbecue sauce, if you choose. What's to stop you?  Like I said, make up your own Conglomerate burger!   So tasty!