Add the steel-cut oats, milk, pumpkin puree, maple syrup, pumpkin pie spice, vanilla extract, and salt to the slow cooker.
Stir everything together until the pumpkin and spices are evenly mixed into the liquid.
Cover and cook on low for 6 to 7 hours, until the oats are tender and have absorbed most of the liquid.
Give the oats a good stir right before serving to loosen the texture.
Spoon into bowls and top each serving with the chopped pecans.