Add tomato sauce, mushrooms, oregano, and garlic salt to the meat and mix well.
Place the top and bottom buns on a baking sheet, inside up.
Spoon meat mixture onto the buns or English muffins.
Sprinkle cheese on top and bake until bubbly. More cheese can be added if desired.
I especially like Mozzarella on top.These can be frozen before baking and baked later.This recipe came from our school cafeteria many years ago. It was adjusted for home use. This was way back when things were made from scratch.