There is a recipe for steel cut oats in the slow-cooker.. but America's Test Kitchen/Cooks country also has a delicious recipe for steel cut oats...
Slow Cooker:
Ingredients
1 cup steel cut oats
1 cup dried cranberries
1 cup dried figs
4 cups water
1/2 cup half-and-half
Directions
In a slow cooker, combine all ingredients and set to low heat. Cover and let cook for 8 to 9 hours.
Stir and remove to serving bowls. This method works best if started before you go to bed. This way your oatmeal will be finished by morning.
Recipe courtesy Alton Brown
10 Minute Steel-Cut Apple Cinnamon Oatmeal
3 cups water
1 cup steel-cut oats
1/4 teaspoon salt
1 cup whole milk (or nut milk)
1 teaspoon cinnamon
1 apple, grated
2 tablespoon dark brown sugar
chopped mixed raw nuts and maple syrup for topping
1. The night before, bring 3 cups water to boil in large saucepan over high heat. Remove pan from heat; stir in oats and salt. Cover pan and let stand overnight.
2. In the morning, stir milk, cinnamon, apple, and brown sugar into oats and bring to boil over medium-high heat. Reduce heat to medium and cook, stirring occasionally, until oats are softened but still retain some chew and mixture thickens and resembles warm pudding, 4 to 6 minutes.
3. Remove pan from heat and let stand for 5 minutes. Stir and serve, passing desired toppings separately (I like chopped mixed raw nuts and maple syrup).
PS We buy the steel cut oats that are in a white can with black writing - Irish Oats