Boil eggs. Bring a pot of water to a boil, add 6 eggs, and simmer 8–9 minutes for firm centers.
Chill and peel. Transfer eggs to an ice bath for 5 minutes, then gently peel and pat dry.
Season sausage. Mix sausage with Dijon, Worcestershire, salt, pepper, paprika, garlic powder, and onion powder.
Portion sausage. Divide into 6 equal balls and flatten each into a thin patty on parchment.
Set up dredging. Put flour in one bowl, beaten egg in another, and breadcrumbs in a third.
Wrap eggs. Encase each peeled egg in a sausage patty, sealing seams well with damp hands.
Bread neatly. Roll each in flour, dip in egg, then coat all over with breadcrumbs. Chill 10 minutes.
Heat oil to 350°F in a deep pot. Fry 2–3 at a time until golden and cooked through, 5–6 minutes.
Drain and serve. Rest on a rack for 3 minutes. Slice or serve whole with mustard.