This is how I will sometimes prep my sweet potatoes for the week. I cut them into slices and sprinkled cinnamon and truvia on top (I cut up 5 sweet potatoes and only needed to use two packets of truvia). I only did one side but you could flip them and put the cinnamon/truvia on both sides if you wanted. I cooked them for about 35 minutes on 350. Once they were cooled I portioned them out and put them in 5 different ziploc baggies (each between 4-6 ounces weighed on my food scale after they have been cooked) so all I have to do is grab one packet, grab a lean protein source, some veggies, and go! :)
You could also play around with the spices and do things like garlic powder, chili powder, etc.