Thaw and mash the frozen sweet cherries at room temperature for about 15-20 minutes, then mash them in a bowl.

In a medium jar, mix together the mashed cherries, oats, and dairy-free milk. Add almond butter, ground flaxseed, maple syrup, and any optional ingredients, stirring until well blended.

Cover the jar tightly and refrigerate for at least 3 hours or overnight to allow the oats to absorb the flavors.

Before serving, stir the mixture and add more dairy-free milk if too thick. Serve cold, optionally topped with fresh cherries, nuts, or granola.