Delicious Meatball Sub Recipe

Meatball Sub a great Lunch or Dinner.
Ingredients:
1 lb. Minced Beef,
1 Egg,
2 Burger Buns (any white Roll or Bread),
1/4 cup milk (lukewarm),
1 tsp Salt,
1/2 tsp Italian Seasoning,
1/2 tsp Paprika,
1/2 tsp Pepper,
1 onion (diced),
2 Garlic Clove (minced),
2 tbsp Parsley (chopped),
1/2 tsp Mustard,
4 tbsp Butter,
3 French Sandwich Rolls,
24 oz. Marinara Sauce,
6 oz. Mozzarella Cheese (shredded)