"Get homey meatloaf flavor in burger form...."
INGREDIENTS
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1/2 cup old-fashioned rolled oats
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1/4 cup whole or 2% milk
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1 large egg
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3 tablespoons ketchup
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1 tablespoon Dijon mustard
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1/2 teaspoon smoked paprika
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1 1/4 teaspoons kosher salt, divided
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1 small carrot (about 2 ounces)
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1 medium shallot
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1 ounce Parmesan cheese (1/2 cup firmly packed freshly grated or 1/3 cup store-bought grated)
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1 pound ground beef chuck (80% lean)
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8 ounces cremini mushrooms
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3 tablespoons olive oil, divided
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4 potato or brioche bunsBibb lettuce leavesSliced picklesSliced tomatoMayonnaiseMustardKetchup