Heat oven to 400 Degree. Line baking sheet with parchment paper.
Place the cut squash onto the baking sheet and bursh with olive oil. Bake for 10 minutes, flip the squash and bake for another 10 minutes. Let cool slightly.
Place the squash and cilantro a blender or food processor and puree on high for 1-2 minutes, adding the liquid in if needed.