Add the coconut oil, sourdough discard, maple syrup, and brown sugar to a small saucepan over medium-low heat and whisk for 2-3 minutes until the mixture begins to bubble. Remove from heat and add whisk in the vanilla extract and salt.
Combine the rolled oats, crisp rice cereal, and chopped nuts in a large mixing bowl and pour the sourdough mixture over the dry ingredients. Use a spoon or spatula to stir the granola bar mixture until well combined.
Press the granola bar mixture into a 9x9-inch dish lined with parchment paper. Sprinkle chocolate chips over the mixture and press them in.
Place the granola bars in the fridge and allow them to set for a couple of hours before serving.