have you taken the burners out? if the powder got on them then it will smell every time. if you can pull them out easily, then depending on the coating you could try a
(nylon)brush ,plus or make a paste out of baking soda and scrub with a nylon brush on the burners and oven walls.
but a quick google search says that it may be baked into the oven and any scratchs in the oven won't help to get it out.