Place spinach (or other greens) in a microwave-safe dish; add 1 Tbsp. water and cover. Microwave on High, stirring occasionally, until just wilted, 1 to 2 minutes. Transfer to a colander to drain. When cool enough to handle, squeeze out any excess water. Coarsely chop and set aside.
Heat oil in a large nonstick skillet with high sides or a Dutch oven. Add onion and cook, stirring, until translucent, about 8 minutes. Add ginger, jalapeño, garlic, and curry powder; cook, stirring, for 30 seconds. Add carrots and 2 Tbsp. water; cover and cook, stirring occasionally, until the carrots have softened, about 10 minutes (add more water if the mixture becomes dry). Add cauliflower; cover and cook, stirring occasionally, until barely tender-crisp, 5 to 10 minutes more.
Stir in chickpeas, tomatoes, half-and-half, and coconut milk. Bring to just below boiling. Reduce heat to low and simmer uncovered, stirring occasionally, for 15 minutes. Stir in the reserved spinach (or greens) and heat through.
Transfer half of the mixture (about 5 cups) to a 1½-qt. freezer container; label and freeze for up to 1 month. Serve the remaining half at once, or refrigerate for up to 3 days.
To make ahead: This double-batch recipe makes one meal for tonight (or to refrigerate for up to 3 days) and one to freeze for up to 1 month (see Step 4). To cook from frozen: Thaw overnight in the refrigerator, then microwave on High until heated through, 4 to 5 minutes. You can also reheat the stew in a saucepan until bubbling; add a little water, if needed, to prevent sticking.
249 calories;7 g fat(1 g sat); 10 g fiber; 39 g carbohydrates; 11 g protein; 145 mcg folate; 1 mg cholesterol; 7 g sugars; 0 g added sugars; 7,766 IU vitamin A; 51 mg vitamin C; 137 mg calcium; 3 mg iron; 309 mg sodium; 588 mg potassium
Vitamin A (155% daily value), Vitamin C (85% dv), Folate (36% dv)