Swedish Meatballs

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• 2 tablespoons olive oil(divided in half)
• 0.5 cup yellow onion(finely diced)
• 2 cloves garlic(minced)
• 0.5 cup panko breadcrumbs
• 0.25 cup parmesan cheese
• 1 large egg(beaten)
• 0.25 cup milk
• 1 teaspoon salt
• 0.5 teaspoon oregano
• 0.25 teaspoon allspice
• 0.13 teaspoon ground nutmeg
• 0.25 teaspoon pepper
• 1 pound ground beef(80% lean)
• 0.5 pound ground pork
• 4 tablespoons butter
• 4 tablespoons flour
• 2.5 cups beef broth
• 2 teaspoons Worcestershire sauce
• 1 teaspoon mustard powder(or Dijon mustard)
• 1 teaspoon parsley(chopped)
• 0.5 cup heavy cream(at room temperature)