In a large bowl, whisk together the turmeric, cayenne, 1 teaspoon salt and 1 tablespoon oil. Gently, drop in the cubes of paneer and gently toss, taking care not to break the cubes if you're using the homemade kind. Let the cubes marinate while you get the rest of your ingredients together and prepped.
In a food processor, pulse the greens until finely chopped.
Place a large nonstick skillet over medium heat, spray with cooking spray, and add the paneer as the pan warms. In a couple of minutes give the pan a toss; each piece of paneer should be browned on one side. Fry another minute or so, and then remove the paneer from the pan onto a plate.
Add the remaining 1/2 tablespoon oil to the pan. Add the onions, ginger, garlic and chile. Now here's the important part: sautè the mixture until it's evenly toffee-coloured, which should take about 15 minutes. Don't skip this step - this is the foundation of the dish! If you feel like the mixture is drying out and burning, add a couple of tablespoons of water.
Add the curry powder, coriander and cumin. If you haven't already, sprinkle a little water to keep the spices from burning. Cook, stirring often, until the raw scent of the spices cook out, and it all smells a bit more melodious, 3 to 5 minutes.
Add the spinach and stir well, incorporating the spiced onion mixture into the spinach. Add a little salt and 1/2 cup of water, stir, and cook about 5 minutes with the lid off.
Turn the heat off. Add the yogurt, a little at a time to keep it from curdling. Once the yogurt is well mixed into the spinach, add the paneer. Turn the heat back on, cover and cook until everything is warmed through, about 5 minutes. Serve.
