Mushroom Swiss Cheeseburgers
rec.food.cooking/Jill McQuown (2001)

4 French rolls
3 Tbsp. butter
2 green onions, finely chopped
1/4 lb. mushrooms, sliced
1 lb. lean ground beef
1/2 tsp. garlic salt (I'd use minced garlic and add some salt)
6 oz. shredded Swiss cheese

Cut French rolls in half lengthwise and spread with softened butter. Broil rolls until lightly browned; set aside.

Melt 3 tablespoons butter in a skillet and saute the onions and mushrooms (and garlic, my choice) until just tender. Remove from heat and let cool.

Mix together with sauteed mushrooms and onions the ground beef and cheese. Pat mixture evenly on toasted French roll bottoms. Bake in a 450F oven for about 20 minutes until nicely browned.

Reheat the tops briefly; season with salt & pepper to taste.