INGREDIENTS
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1 pound lean ground beef
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2 tablespoons butter
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1 small yellow onion, diced
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8 ounces brown mushrooms, minced
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2 tablespoons ketchup
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1 tablespoon Worcestershire sauce
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1/2 teaspoon Kosher salt
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1/2 teaspoon fresh ground black pepper
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3 bell peppers split in half and de-seeded (through the stem)
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8 ounces shredded cheddar cheese, divided
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1 cup beef broth