Preheat the oven to 400°F (200°C) and line a large baking sheet with parchment paper.
In a large bowl, toss the sweet potato rounds with olive oil, salt, and black pepper until evenly coated.
Arrange the sweet potato slices in a single layer on the prepared baking sheet.
Roast for 20 to 25 minutes, flipping the slices halfway through, until tender and caramelized on the edges.
In a separate bowl, mix the shredded chicken with the barbecue sauce until fully incorporated.
Remove the sweet potatoes from the oven and top each round with a portion of the barbecue chicken mixture.
Return the sliders to the oven for an additional 5 to 7 minutes to heat the chicken through.
Garnish with sliced red onion and chopped cilantro before serving.