INGREDIENTS
1 1/2 lb
(at least 80%) ground beef, lean
3
Garlic cloves, large
1/2 tsp
Garlic powder
1
package Mushrooms, fresh
1
Onion, medium
2
Tomatoes, medium
3 tbsp
Soy sauce
1/2 tsp
Pepper
1 tsp
Salt
6
Burger buns
2 tbsp
Butter
6
slices Swiss cheese