Combine yogurt, lime juice, and 1/4 cup water in small bowl and set aside.
Heat large skillet over medium-high heat until pan is very hot, 3 to 4 minutes. Add oil, swirling pan to coat evenly. Add florets and sauté, stirring occasionally, until they begin to soften, 2 to 3 minutes. Add onions, continue sautéing until florets begin to brown and onions soften, about 4 minutes.
Stir in cumin, coriander, turmeric, and pepper flakes; sauté until spices begin to toast and are fragrant, 1 to 2 minutes. Reduce heat to low and add yogurt mixture. Cover and cook until flavors meld, about 4 minutes. Add cilantro, toss to distribute, cover and cook until florets are fully tender but still offer some resistance to the tooth when sampled, about 2 minutes more. Season with salt and pepper to taste and serve immediately.
Serves 6