Preheat your oven to 425°F (220°C) and line a large baking sheet with parchment paper.
Scrub the sweet potatoes and slice them into uniform ½-inch thick rounds.
Arrange the sweet potato rounds in a single layer on the prepared baking sheet. Brush both sides with olive oil.
Roast for 15 minutes, then remove the tray and flip each sweet potato round over.
Place one slice of smoked sausage on top of each sweet potato round.
Return the baking sheet to the oven and bake for another 10–12 minutes, or until the sausage edges are browned and the sweet potatoes are fork-tender.
Let the bites rest for 3 minutes before transferring them to a serving plate. Serve hot with toothpicks if desired.