Sunny's Patty Melt Muffaletta

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Mushroom Topping:

1 tablespoon butter

1 tablespoon olive oil

8 fresh sprigs thyme, stripped and chopped

1/2 onion, finely chopped

1/2 serrano chile pepper, seeded and finely chopped

Pinch salt

Grind or two freshly ground black pepper

8 button mushrooms, sliced

Patty:

1 teaspoon Worcestershire sauce

1/2 teaspoon salt

A few grinds freshly ground black pepper

1 clove garlic, grated on a rasp

8 ounces ground chuck

Two 7-to-8-inch-round flatbreads, such as Aladdin or Metsuyan

3 slices American cheese

4 strips bacon, cooked and chopped

4 ounces smoked mozzarella, sliced or torn into bits

Ketchup, for serving