Heat olive oil in a skillet over medium heat. Add diced onion and cook for about 5 minutes until translucent.

Add minced garlic and cook for an additional 30 seconds until aromatic. Remove from heat and cool slightly.

In a large bowl, combine sautéed onion and garlic with spinach, ground chicken, breadcrumbs, Greek yogurt, dill, lemon juice, oregano, paprika, cumin, salt, and pepper. Mix gently.

Divide mixture into 8 equal portions and shape into patties about ½ inch thick.

Heat remaining olive oil in the skillet and add the patties. Cook for 5-6 minutes on each side until golden brown and cooked through.

Transfer to paper towel-lined plate to drain excess oil. Serve warm, garnished with dill or yogurt if desired.