Split the bread lengthwise. Optionally, hollow out the loaf by removing some of the bread. Love toppings? Hollow it out. Want less topping? Don't hollow it out. (You might have topping left over).
Crumble sausage into a large skillet with the oil and cook until done.
Remove and let cool. Optionally, transfer sausage to a food processor and pulse a few times to make the meat finer.
Transfer meat to a large bowl.
Add the remaining ingredients and stir.
Spread mixture out onto the bread halves.
Place bread on baking sheets and bake for 10-15 minutes or until the bread is crunchy and the cheese starts to melt. Place under the broiler to brown lightly if desired.