Pre-heat oven to 425F. Line a baking sheet with foil for easy clean-up.
Cut sweet potato into 1/4 inch slices. Toss them in a bowl with olive oil, honey, sumac, and salt. I found using two spoons to do this was the easiest way.
Place sweet potato slices on baking sheet in a single layer. Bake for 30 minutes. Serve hot.
As every oven is different and slices will vary in size from what I did, I recommend closely watching your sweet potatoes starting around the 20 minute mark. You can always check them to see if they're done to your liking and put them back in the oven if necessary.
The recipe is easily doubled. I recommend doubling it if you're feeding more than 1-2 people or it's more than a side dish/snack. I reheated the rest the next day using the microwave. And, while still tasty, I did not enjoy them as much as when they were fresh out of the oven.