Combine ground beef, Panko, parsley, allspice, nutmeg, onion, garlic, salt, pepper, and egg in a medium-size mixing bowl. Mix well using a spatula until thoroughly combined.
Add the sour cream and stir until the sauce is even throughout. Bring sauce to a boil and simmer until it starts to thicken, 5-7 minutes. Time for a taste test!
Ground pork, 50-50 pork and beef, chicken or turkey can be used for the meat. Panko breadcrumbs have a light and airy texture that helps it crisp while absorbing less oil than regular breadcrumbs.