Preheat oven to 350 degrees F. Prepare a baking sheet lined with parchment paper.
Wash and slice sweet potatoes into 1 inch rounds. Mix the slices in a bowl with salt, pepper, and olive oil until rounds are lightly coated. Place on the baking sheet and bake for ~20-30 minutes, or until tender.
While sweet potatoes cook, Prepare the guacamole. Mash the avocados in a medium sized bowl and mix in all other ingredients. Adjust seasonings if desired.
Let the sweet potatoes cool slightly before placing guacamole on top. Top with fresh cilantro and tomato for garnish and serve immediately!