Heat broiler to low; place garlic cloves (unpeeled) on middle oven rack; check after 10-15 minutes. If slightly brown and very soft to touch, remove. Place large skillet or dutch oven over medium-high heat; spray pan with nonstick spray. Add pressed garlic, stir until fragrant. Add tomato through oregano; stir until slightly bubbling, then turn heat down to med-low. Cover and simmer for 15-20 minutes. Combine yogurt, lemon, salt and Greek seasoning. Serve chili topped with yogurt, feta and pita.