Cut the chicken breast into bite-sized pieces.
Marinate the chicken with yogurt, curry powder, lemon juice, and salt.
Heat olive oil in a pan and sauté chopped onions.
Add minced garlic and ginger and stir-fry.
Add the chicken pieces and cook until done.
Add tomato puree and spices, then bring to a simmer.
Add low-fat milk and a little butter, then reduce down.
Season with salt and pepper.
Plate and serve.