INGREDIENTS
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1 pound ground sirloin
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Cooking spray
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1 tablespoon olive oil
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1/4 cup thinly sliced yellow onion
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1/8 teaspoon salt
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1/8 teaspoon black pepper
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1 (8-ounce) package sliced cremini mushrooms
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1 1/2 teaspoons all-purpose flour
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1/4 cup dark beer (such as porter)
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8 (1.1-ounce) slices rye bread
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4 (3/4-ounce) slices reduced-fat provolone cheese
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