Squash and Chickpea Moroccan Stew

I have not had a chance to try this yet. From Ask Aida's "Light & Healthy" episode. You can substitute veggie stock for the chicken stock to make this recipe vegetarian, and of course you can opt not to use the yogurt to make it vegan as well. :)

• Ready In: 27 mins
• Serves: 6-8

Ingredients

• 1  tablespoon unsalted butter
• 1  tablespoon olive oil
• 1  medium yellow onion, small dice
• 4  medium garlic cloves, thinly sliced
• 2  teaspoons ground cumin
• 1 (3 inch)  cinnamon sticks
•  salt & freshly ground black pepper
• 1  lb  butternut squash, large dice
• 3⁄4 lb  red potatoes, large dice
• 2  cups low sodium chicken broth or 2  cups vegetable broth
• 2  cups  cooked chickpeas, drained
• 1 (14 ounce) can diced tomatoes, with juices
• 1  pinch saffron thread (optional)
• 1⁄2 preserved lemon, finely chopped
• 1  cup green olives in brine (recommend ( Cerignola)
•  steamed couscous, for serving
•  fresh cilantro leaves, roughly chopped, for garnish
•  toasted  slivered almonds, for garnish
•  plain yogurt, for garnish

Directions

1. Heat butter and olive oil in a 3- to 4-quart Dutch oven or heavy-bottomed saucepan with a tight fitting lid over medium heat. When oil shimmers, add onion, garlic, cumin, and cinnamon, and season with salt and freshly ground black pepper. Cook, stirring occasionally, until spices are aromatic and onions are soft and translucent, about 5 minutes.
2. Add squash and potatoes, season with salt and freshly ground black pepper, stir to coat, and cook until just tender, about 3 minutes. Add broth, chickpeas, tomatoes and their juices, and saffron, if using. Bring mixture to a boil then reduce heat to low. Cover and simmer until squash is fork tender, about 10 minutes.
3. Remove from heat and stir in preserved lemon and olives. Serve over couscous garnished with cilantro, almonds, and yogurt.