Cooking stove is causing a short circuit, how do I diagnose it further?
Visually inspect the igniters. If if you see any cracks in them or burned wires, that's almost certainly the fault to fix. 

If you don't see anything wrong with the igniters, check with an ohmmeter if there's short between line and ground on the input plug of of stove. It's not clear to me from your description of the problem if the breaker disconnects when you push the spark/lightning button or all the time... but try to repeat the scenario with the ohmmeter. If there's a fault to ground somewhere, it's almost certainly from a wire with burnt insulation... somewhere inside the stove; you'll have to trace/inspect all the wires.