Start by greasing the inside of your 4-quart slow cooker with 3 Tablespoons of butter. Be sure to coat the bottom and sides thoroughly to prevent sticking.
Combine 6 cups of milk, 2 cups Minute® White Rice, ¾ cup sugar, ¼ teaspoon salt, ½ teaspoon cinnamon, ⅓ teaspoon vanilla extract, and 2 Tablespoons of brown sugar directly in the crockpot. Stir everything together gently.
Dot the top with the remaining butter for extra richness.
Cover your slow cooker and set it to low heat. Let it cook for 3-4 hours, stirring occasionally—about every 45 minutes to an hour.
Once the rice is tender and creamy, give it a final stir. Serve warm, topped with cinnamon or your favorite mix-ins.