Preheat oven to 450.
In a large mixing bowl, combine zucchinis, squash peppers, garlic, olive oil, salt, and black pepper.
Spread evenly the contents of mixing bowl in a baking sheet sprayed with cooking spray.
Place baking sheet in oven, cook for 20-35 minutes until the zucchinis and squash pieces are soft (depending on how large your zucchini / squash pieces are, cooking times may vary – you will know they are done when you can easily stick a fork into it).
When cooking is done, remove pan from oven, and let cool for about 20 minutes.
Place all Roasting phase and all blender phase ingredients in a blender, and blend until smooth.