Add the apples to your slow cooker. Stir in the lemon juice, sugar, brown sugar, and cinnamon. Top with the pieces of butter (don't mix).
Cover with a lid and cook on low for 2-4 hours, until the apples are very soft and tender.
In a small bowl, whisk together the cornstarch and water to create a slurry. Add to the crockpot and stir, then cook on high for an additional 15 minutes (the liquid should thicken). Remove the lid and stir again.
Serve as-is, or as we prefer, with vegan waffles and a scoop of vanilla nondairy ice cream!