Preheat oven to 425 degrees. Line a baking sheet with parchment paper or foil and add chopped butternut squash, carrots, oil and 1 tsp salt. Toss to combine then roast for 25 minutes or until fork tender.
Pour the butternut squash and carrots mixture into a high powered blender along with the remaining ingredients.
Blend on high until smooth (if you blender has a “soup” button, I recommend using that).
Pour the mixture into a large pot over medium high heat and bring to a simmer. Cover and let simmer, stirring occasionally for 30 minutes.
Pour into jars and store in the refrigerator until ready to use.
Notes
You can turn this into a delicious soup by adding 4-6 cups of chicken or beef broth (or more depending on how thin or thick you like soup) to the simmering sauce!