Sauté onions and garlic in t tbs. olive oil, over medium heat, until tender. Add squash and carrots. Cook an additional 4-5 minutes. Add salt and pepper and stock. Blend in blender or with hand mixer.
Return to sauce pan, bring to boil and reduce heat to medium-low. Cook for 20-30 minutes. Stir in the essential oils and serve after 5 minutes.