Prep the apples: Peel, core, and chop apples into roughly 1-inch pieces. Uniform pieces cook evenly.
Load the slow cooker: Add apples, water (or cider), salt, and cinnamon if using.
Stir to combine.
Cook low and slow: Cover and cook on LOW for 6–8 hours or HIGH for 3–4 hours, until the apples are very soft.
Adjust sweetness: Taste. If you want it sweeter, stir in sugar, honey, or maple in small amounts. Start with 1 tablespoon, then adjust.
Choose your texture: For chunky sauce, mash with a potato masher.
For smooth sauce, use an immersion blender right in the slow cooker or transfer to a blender and blend carefully.
Finish and cool: Add optional vanilla or lemon juice if you like. Let the applesauce cool before transferring to jars or containers.