Preheat the oven to 400F and line a baking sheet with parchment paper.
Add all of the vegetables to the sheet pan, along with the salt, black pepper and dried basil. You can add a drizzle of olive oil at this point if desired.
Place in the oven for 40 minutes, until the vegetables are roasted.
Once safe to handle, add all of the vegetables to a blender, squeezing out the garlic cloves and discarding of the skin. Blend until a sauce is formed. At this point, blend in the coconut milk or vegan cream, if desired. Taste and adjust salt as needed.