Place all of the ingredients into a crockpot, and stir to combine. Set to high and cook for 5–6 hours, stirring occasionally. Whisk until mostly smooth.
Uncover and cook on high for 30 minutes longer to allow excess liquid to evaporate.
Let cool slightly, then transfer to mason jars or another freezer-safe container. Leave some room at the top for the mixture to expand in the freezer.
Refrigerate any apple butter that you’ll use within 2 weeks, and freeze the remaining apple butter.
Notes
I like using a variety of apples for this recipe. Use your favorite types of apples. The sugar amount can be anywhere between 1 and 4 cups. I used 3 cups for a sweetness that mimics most commercially prepared apple butters. You can add an extra teaspoon of cinnamon if you'd like. Want to cook it on low? Let it cook on low for 9–11 hours, or until the apples fall apart when whisked. Remove the lid and allow it to cook for an additional hour to allow excess liquid to evaporate. This recipe has a little bit of texture to it. If you want a perfectly smooth apple butter, blend it in a blender or with an immersion blender.