Preheat the oven to 350 F.
Slice the French loaf open and lay it flat on baking sheet.
In a skillet, brown the ground beef. Once browned, drain if needed. Stir in the homemade Philly cheesesteak seasoning mix with 1/4 cup of water. Add the bell peppers and onion slices and saute for 5 to 6 minutes, or until softened.
Spread the browned ground beef with peppers and onions onto the sliced bread. Place the Swiss cheese slices to cover as much of the beef as possible.
Bake in the preheated oven for 20 minutes, or until cheese has melted. Let cool slightly before slicing into "mini-sandwiches."
Serve $1 Loaf Bread Philly Sandwiches with favorite side salad or veggies. Enjoy!