Preheat oven to 425°F (220°C). Line a large baking sheet with parchment paper.
Pat sweet potato rounds dry with paper towels.
In a large bowl, toss sweet potato rounds with olive oil, salt, pepper, and garlic powder.
Arrange in single layer on prepared baking sheet, ensuring pieces don't overlap.
Roast for 20-25 minutes, flipping halfway through, until tender and lightly caramelized.
Meanwhile, mix softened goat cheese with honey in a small bowl until smooth.
Remove sweet potatoes from oven and let cool for 5 minutes.
Top each round with a dollop of honey goat cheese mixture.
Sprinkle with chopped chives, walnuts, thyme, and red pepper flakes if using.
Serve immediately while warm.
