"It's a one-pan meal that's ready in under an hour!..."
INGREDIENTS
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1/2 c. plus 1/3 c. whole milk, divided
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2/3 c. panko breadcrumbs
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1 large egg
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2 garlic cloves, grated
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1 1/2 tsp. kosher salt, divided
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3/4 tsp. ground black pepper, divided
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1/4 tsp. ground nutmeg
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1/4 tsp. ground allspice
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1/2 lb. lean ground beef
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1/2 lb. ground pork
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3 tbsp. salted butter, divided
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1 (16-oz.) box frozen pierogies
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2 tbsp. olive oil
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1/2 yellow onion, chopped
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2 tbsp. all-purpose flour
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1 1/2 c. beef broth
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1 tsp. Worcestershire sauce
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1 tsp. dijon mustard
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2 tbsp. chopped fresh parsley or dill, to serve