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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Wash and dry produce.
Slice sweet potatoes into ¼-inch-thick rounds. TIP: Slicing your potatoes into thin, uniform slices is key! This will help them all roast at the same pace.
In a large bowl, toss sweet potatoes with a large drizzle of oil, and a couple big pinches of salt and pepper; arrange on one side of a baking sheet in a single overlapping layer. (For 4, spread potatoes out across entire sheet.)
Roast on top rack for 10 minutes (you’ll add more to the sheet then).