Add the garlic, ginger and chilli and fry for a few minutes. Stir in the garam masala and turmeric. If the pan is too dry, add a splash of water so the spices do not stick to the pan and burn.
A classic Indian aloo gobi but not as you know it ... mashed potatoes and garam masala and stir well. It should resemble a dry mashed potato-like texture. If it seems too wet, keep cooking ...