I got this recipe from Plain Chicken and I adapted it. We had it for dinner but it would make a wonderful appetizer. It's really easy to make. This picture is not the best because it is from the end of the loaf. I forgot to take a picture until we had already ate most of it.
1 lb pork sausage
2 c. shredded mozzarella cheese
2 T. Dijon mustard
1/2 t. salt
1/4 t. pepper
2 T. butter
1 clove garlic, crushed
Hollow out the middle of the loaf with a long serrated knife, leaving a 1/2 inch shell around the sides. Crumble up the bread that you removed into bread crumbs. Cook sausage until meat is browned, then drain. Stir in 1 cup breadcrumbs, cheese, egg, mustard and salt and pepper. Spoon into shell. Melt butter in saucepan. Add garlic and cook 1 min. Brush garlic butter over loaf. Wrap loaf in foil, leaving top open slightly. Place on a baking sheet. Bake at 400 for 25 min.