In a large sauté pan, heat some vegetable oil. Add garam masala and chopped onions, and cook until the onions start to soften.

Add garlic paste, ginger paste, tomato paste, turmeric, and water. Stir until a sauce has formed. Add chopped chicken breast and cook until the chicken is thoroughly cooked.

Add the spinach and cook until it has warmed through, then finish with a little Greek yogurt. Check for seasoning, and serve!