Pour the 1 tablespoon of oil in the slow cooker. Using a paper towel rub it all over the inside of the crockpot to prevent the rice from sticking. You can also spray it with cooking spray.
Add the 2 cups rinsed brown rice, 3 cups chicken broth, and the 1 teaspoon of kosher salt. Cover and set the crockpot on high for 3 hours.
Stir in scallions, cranberries, and butter. Taste and season with salt and pepper if desired and serve.