Cheeseburger Party Meatballs

Bahan-bahan (25 porsi)

• 500 g / 1 lb beef mince ((ground beef))
• 1 tsp onion powder
• 1/2 tsp garlic powder
• 1/2 tsp salt
• 1/2 tsp black pepper
• 1 1/2 tsp Worcestershire Sauce
• 1 cup panko breadcrumbs ((or 3/4 cup normal breadcrumbs))
• 1 egg
• 1 tbsp oil
• 6 - 8 processed cheese slices ((Note 1))
• Baby gherkins
• Ketchup (, to serve)