Combine all ingredients in the slow cooker and stir to combine.
Cover and cook on low for 6-8 hours (overnight) or on high for 3 to 4 hours, until the oats are soft but maintain a bit of chew.
Remove the cover and stir to evenly combine the ingredients, scraping the oats off the bottom and away from the sides.
.Enjoy warm with desired toppings.
Notes
LeftoversTransfer leftover oatmeal to an airtight container and store it in the refrigerator for up to 4 days or freeze for up to 3 months.Reheat in the microwave or on the stovetop, adding a splash of milk or a little water. Microwave in 30-second intervals, stirring between each, until heated though. On the stovetop, use a small saucepan over low to medium heat, stirring often until warmed through.