Set out slow cooker or crock pot and turn onto low heat. (You can also use a large dutch oven pot with lid on low heat.)
In a small bowl combine spices, brown sugar, maple syrup, and vanilla. Stir together until blended.
Place apple chunks into pot and pour maple syrup mixture over them.
Stir until all apple chunks are coated.
Place lid on slow cooker and leave for 6 hrs. (stirring a couple times during cooking).
Once apples have broken down into a darker color, turn off slow cooker.
Transfer half of the mixture to a blender and puree the apple chunks. Or place a handheld immersion blender into the pot and puree half of the chunky apple butter. (Option to puree all chunks for a smoother apple butter. Be careful transporting hot mixture! )
Pour puree back into slow cooker.
Stir together puree and leftover chunks.
Turn heat back on low for an additional 30 minutes to an hour. Leave lid off to help with thickening.
Once butter is thickened, turn off slow cooker. Let cool completely.
Transfer to a mason jar with lid and store in the fridge.
Notes
Storage:
Cool completely: Let the apple butter cool before storing.
Refrigerate: Transfer to a heatproof, airtight container (mason jars work great!) and refrigerate for up to 1 month.
Freeze: For longer storage, place in a freezer-safe, airtight container and freeze for up to 6 months.