Mushroom and Swiss Burger Foil Packets

Ingredients:
1 lb ground beef
1 teaspoon Worcestershire sauce
1 teaspoon garlic powder
Salt and pepper, to taste
4 slices Swiss cheese
1 1/2 cups sliced mushrooms
1/2 small red onion, thinly sliced
1 tablespoon olive oil
1 lb baby potatoes, halved
1 teaspoon Italian seasoning
1 tablespoon butter (optional, for extra richness)
Non-stick cooking spray or foil-friendly oil

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