slice bread in half lengthwise
place the bread under broiler (but not on the closest rack to the heating element, go down one rack) on high for 2 minutes to crisp the inside of the bread
Heat chicken if it's cold (this is a great way to use leftover chicken)
place chicken, olive oil and lemon in bowl and toss until it's all coated
place Romano/Parmesan cheese on bread, top with remaining ingredients, placing them evenly on each piece of bread so each bite will have lots toppings.
sprinkle the top of the pizza with oregano
place under broiler for 3 minutes or until the cheeses are melted and the bread is golden on the edges.
*keep an eye on the food under the broiler, you don't want to burn it