Broken oven

First, verify it is the problem. (A working element has a conductive core, or wire, all the way through it). If the core wire is broken, it is defective. To verify it is broken, use an Ohmmeter - if value is above 500 Ohms the core is likely broken. Replace it.

To test without an Ohm meter, use a flashlight bulb and flashlight batteries, some wire and run the loop through the element. If bulb lights, core is ok.

If broken, take it in to any small appliance store as most oven elements are VERY similar. Likely they will have one in stock. They will be cheaper than over the internet.