First, preheat your oven to 400°F (200°C). Toss your sweet potato rounds with olive oil, salt, pepper, and garlic powder. Arrange them in a single layer on your baking sheet.
While the potatoes are roasting, place the chopped walnuts in a dry skillet. Toast them over medium heat for about 3-4 minutes, stirring often until they become fragrant and lightly browned.
Once the sweet potatoes are tender and golden, remove them from the oven. Let them cool for just a minute or two, then spread a generous spoonful of sage pesto onto each round.
Now for the best part. Gently tear the burrata balls and place a piece on top of the pesto on each sweet potato slice. The warmth will help it soften slightly.
Sprinkle the toasted walnuts and pumpkin seeds over the top. Finish with a light drizzle of extra virgin olive oil and a pinch of crushed red pepper flakes if you like a little heat.