Mushroom and Swiss Burger Foil Packets – FadedMix

Ingredients

• 1 lb ground beef
• 1/2 tsp salt
• 1/2 tsp black pepper
• 1 tbsp Worcestershire sauce
• 8 oz mushrooms, sliced
• 1 small onion, thinly sliced
• 4 slices Swiss cheese
• 4 hamburger buns
• 1 tbsp olive oil
• Cooking spray
• Optional toppings: lettuce, tomato, pickles, ketchup, mustard