Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Dice the zucchini, red bell pepper, and red onion into uniform bite-sized pieces.
Toss the chopped vegetables on the baking sheet with olive oil, sea salt, and black pepper.
Roast the vegetables for 15-20 minutes until they are tender and show slight caramelized edges.
In a large deep skillet or tagine pot over medium heat, combine the tomato puree, vegetable broth, cumin, coriander, cinnamon, and turmeric.
Stir in the cooked chickpeas and the roasted vegetables, allowing the mixture to simmer for 10 minutes until the sauce thickens slightly.
Remove from heat and serve the tagine in shallow bowls.
Top each serving with a large dollop of non-fat Greek yogurt and garnish with fresh cilantro.