How long do i need to cook a sweet potatoes in the oven?

Turn on the oven function of the toaster oven and set the temp to about 375 degrees. Clean the sweet potato and poke some holes in it with a fork so the steam pressure doesn't cause it to explode. Put it in the toaster oven to cook for at least 20 minutes and then check it by poking it to see how soft or firm it is. It needs to be pretty soft so if it's not, put it back in for another 10 minutes and then check it again. Repeat until it reaches desired doneness.