This isn't really a recipe as a money saving technique. Pizzas delivered from the local takeaway take around 20 minutes and cost between £10 and £15 depending on how crazy you go on size, toppings, and extras.
To save a bit of money, we have stopped getting takeaway pizzas, and have started "topping" our own. It takes just as long as waiting for the delivery person, even less on a Friday or Saturday night!
You can put just about anything on your Guerilla Pizza (although, perhaps steer clear from actual Guerillas). Below is a set of ingredients we use as standard with a variation of the odd ingredient depending on what is in the fridge.
1 Frozen pizza
1/4 Medium onion very finely chopped
1-2 Garlic cloves very finely chopped
A handful of grated cheese (because store-bought pizzas never have enough!)
It is important to allow for the extra ingredients when considering the cooking time and temperature, especially if you are cooking from frozen. The solution we use is to lower the temperature by 15-ish degrees celcius and cook for the allotted time on the back of the box (add 5 or so minutes to this if you don't have a fan assisted oven).
Check about 3/4 of the way through cooking, and then as the time is up.
There you have it. For about 1/3 the cost of a [Insert Pizza Company] delivered pizza you get to choose your own ingredients and have a bit left over for some extra beer!