Pretty self-explanatory, but directions are included for the benefit of ideas.
French Bread
Pizza Sauce (or BBQ sauce if you like, or Alfredo sauce--there are lots of substitutions you can make)
Cheese (Mozzarella is what is on most pizzas, but it really doesn't matter what kind of cheese it is)
Other Toppings as desired:
Pepperoni
Banana Peppers
Olives
Mushrooms
Bell peppers
Sausage
Bacon
Canadian bacon
Ham
Pineapple
Chicken
Tomatoes
Onions
Spinach
Jalapenos
Beef (ground or shredded)
Slice your french bread in half (top and bottom, like you were going to make a sandwich with it) and spread with sauce. Layer cheese and toppings on as desired. Cook in the oven at 425 for about 15 minutes, or until cheese is melted and bubbly. Tip: to satisfy lots of people with different tastes, have a build your own pizza party and cut the french bread into smaller sections.