Rinse the rice under cold water until the water runs clear.
In a medium pot, bring broth to a boil, then add rice, olive oil, garlic powder, cumin, and salt. Reduce heat to low, cover, and simmer for 15 minutes. Remove from heat and let sit for 5 minutes before fluffing with a fork.
If using chicken, season with salt, pepper, and a drizzle of olive oil, then grill or cook in a skillet over medium heat for 5-6 minutes per side until fully cooked. Slice into strips.
If using chickpeas, heat them in a skillet with olive oil, salt, and cumin for 5 minutes until slightly crispy.
In a small bowl, whisk together all dressing ingredients until smooth.
Assemble the bowls by dividing the rice among four serving bowls. Top with protein, cherry tomatoes, cucumber, red onion, olives, feta cheese, and parsley.
Drizzle with yogurt dressing before serving.