INGREDIENTS
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1 (8 oz) pkg bella mushrooms, sliced
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1/2 yellow onion, diced
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1 1/2 cups beef broth
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1 pkg brown gravy mix
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1 Tbsp tomato paste
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1 Tbsp Dijon mustard
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2 Tbsp dried parsley
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1 Tbsp Worcestershire sauce
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2 Tbsp corn starch
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4 Tbsp water
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1 1/2 lb ground beef
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1/2 tsp Italian seasoning
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1 large egg yolk
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1/3 cup Panko breadcrumbs
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3 Tbsp milk
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Kosher salt and ground pepper, to taste
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1 Tbsp olive oil
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Fresh parsley, for garnish