Butternut Squash soup

Ingredients

• 1 1/2 lbs. butternut squash (1 sm to med)
• 1 tsp. canola oil
• 2 celery, staks
• 1 sm. onion, diced
• 1 carrot, chopped
• 1 tsp. ground cumin
• 1/2 tsp. ground chipotle chille
• 1/8 tsp. ground cloves
• 6 c. vegetable broth
• 1 tsp. salt
• 1/4 tsp. pepper, freshly ground
• 1/2 c. plain yogurt
• 2 Tbs. fresh chives or parsley