Heat ¼ cup of the coconut milk in a large skillet over medium heat. Add the chopped onion and sauté 4 to 5 minutes until softened.
Add the garlic, Thai green curry paste, turmeric, salt, and pepper and stir well to incorporate. Sauté 1 to 2 minutes until fragrant.
Add the diced tomatoes, mixed vegetables, chickpeas, and remaining coconut milk. Stir to combine. Raise heat to bring to a low boil, then turn down heat to medium-low and simmer for 15 minutes.
Stir in a handful of fresh spinach.
Add a squeeze of fresh lime juice (about ¼ of a lime) and stir.
Optional: If you want a thinner sauce, add ¼ to ½ cup of vegetable broth.
For serving: garnish with chopped cilantro and chopped peanuts, if desired, and serve with cooked rice, noodles, or naan.