Ingredient:

• 1 large potato, peeled and cubed
• 4 (3 ounce) cans tuna, drained
• ¼ cup chopped onion
• 1 egg
• 1 tablespoon Dijon mustard
• 1 tablespoon dry bread crumbs, or as needed
• 1 ½ teaspoons garlic powder
• 1 teaspoon Italian seasoning
• ¼ teaspoon cayenne pepper
• salt and ground black pepper to taste
• 1 tablespoon olive oil