Begin by preparing all your vegetables: dice the onion, mince the garlic and ginger, and chop the carrots, bell pepper, zucchini, and butternut squash.
In the slow cooker, combine the yellow curry paste, coconut milk, and vegetable or chicken broth. Stir well to blend the curry paste into the liquid.
Add the diced onion, minced garlic, and ginger to the slow cooker, mixing until well combined.
Add the sliced carrots, diced red bell pepper, zucchini, and cubed butternut squash into the slow cooker. Include the chickpeas or cooked chicken, depending on your protein choice.
Stir in the soy sauce, lime juice, salt, and black pepper. Mix until all ingredients are well distributed in the slow cooker.
Cover the slow cooker with its lid and set it to cook on low for 6 hours or high for 3 hours.
Once the cooking time is complete, taste and adjust seasoning if necessary. You can add more soy sauce or salt according to your preference.
Serve the yellow curry hot over cooked rice and garnish with fresh cilantro if desired.