Heat oil in a large frying pan or skillet over medium-high heat.

Add cumin seeds and dried red chilies. Sauté, stirring, for about 20 seconds.

Add onions. Sauté, stirring occasionally, for about 2-3 minutes or until browned.

Add garlic and green chilies. Sauté, stirring occasionally, for about 1 minute or until fragrant.

Add potatoes and tomatoes. Stir to combine.

Season with salt.

Cook, covered, for 5-6 minutes or until the potatoes are tender.

Add spinach. Cook, covered, for 1-2 minutes or until the spinach is wilted.

Add garam masala and coriander (cilantro) leaves. Stir to combine. Heat through.

Serve with steamed rice or parathas.