Heat the oil in a large pot over medium-high heat. Once oil is shimmering, add garlic, ginger, and onions. Cook for 3 minutes or until onions are translucent. Add the cauliflower, peas, tomatoes, potatoes, chili powder, curry powder, cumin, salt and pepper. Stir well to combine and then add in the coconut milk. Stir well and bring mixture to a boil. Once boiling, reduce heat to medium-low and let simmer for 20-30 minutes until cauliflower and potatoes are fork tender.