In a bowl, mix ground beef, breadcrumbs, onion, parsley, spices, egg, salt, and pepper.
Roll the mixture into small meatballs (about 1-inch size).
Heat olive oil and butter in a skillet; cook meatballs until browned and cooked through. Remove and set aside.
In the same pan, melt butter for the sauce. Whisk in flour and cook for 1 minute.
Gradually add beef broth while whisking to avoid lumps.
Stir in heavy cream, Worcestershire sauce, and Dijon mustard. Simmer until thickened.
Add meatballs back into the sauce; simmer for 5–7 minutes to coat evenly.
Season with salt and pepper to taste. Serve hot with mashed potatoes or pasta and Easter Punch.