INGREDIENTS
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Yields 1 (8 by 8-inch) pan; about 8 servings
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1 tablespoon butter, diced (plus more to grease the pan)
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1 oz Parmigiano-Reggiano, grated (divided)
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4 tablespoons olive oil
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2 large stalks celery, finely diced
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1 large onion, diced
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1/4 teaspoon salt
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1/8 teaspoon black pepper
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1 bay leaf
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1/2 lb button mushrooms (or any kind you like), thinly sliced
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4 cloves garlic, minced
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1 1/2 teaspoons minced fresh rosemary (or 1/2 teaspoon dried rosemary leaves)
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1 1/2 teaspoons minced fresh thyme (or 1/2 teaspoon dried thyme leaves)
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1/2 cup breadcrumbs
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1 large egg, lightly beaten
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1 1/2 teaspoons Worcestershire sauce*
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4 oz sharp Cheddar, shredded (divided)