Label a gallon freezer bag with the name, date, cook time and instruction to thaw. Add chicken, sweet potatoes, onion, coconut milk, tomatoes, curry powder, ginger, garlic and salt.
Press out air, seal, lay flat and freeze for up to 3 months.
Thaw completely in the refrigerator, knead the bag gently to combine and empty it into a 6-quart slow cooker.
Cover and cook on low for 6 to 6 1/2 hours, until the chicken reaches 165°F and the sweet potato is tender.
At dinner, stir in spinach and lime juice, cover for 5 minutes until wilted and serve.