Cut A Thin Slice Off The Top Of The Bread. Hollow Out Bottom Half, Leaving A 1/4-In. Shell. In A Food Processor Or Blender, Process Bread Crumbs Until Coarse; Set Aside 1 Cup. (Discard Remaining Crumbs Or Save For Another Use.) In A Skillet, Brown Beef, Sausage And Onion; Drain. Stir In Reserved Crumbs, Cheese, Egg, Parsley, Mustard, Pepper, Salt And Fennel; Mix Well. Spoon Into Bread Shell; Replace Bred Top. Place On A Large Sheet Of Heavy-Duty Foil. In A Small Saucepan, Melt Butter; Add Garlic And Cook For 1 Minute. Brush Over Tops And Sides Of Loaf. Seal The Foil. Bake At 400 Degrees F For 20 Minutes Or Until Cheese Is Melted.