In a large skillet, heat the olive oil with sliced onions and sauté on medium high heat until onions are golden and soft, about five minutes. Add the spices and garlic and continue to cook for a minute, just to soften.
Add the black kale, chickpeas and season with salt and pepper. Cover and steam for about five to seven minutes until green are wilted and tender.
Arrange pieces of feta on top of mixture and broil for two to three minutes until cheese is golden.
Remove from oven and drizzle with Greek yogurt and serve immediately.