Begin by greasing your slow cooker with a little oil or lining it with parchment paper to prevent sticking.
In a large mixing bowl, combine the natural peanut butter, honey, unsweetened vanilla almond milk, mashed ripe banana, and eggs. Whisk these ingredients together until well combined and smooth.
To the wet mixture, add in the cinnamon, steel-cut oats, raisins, banana chips, chopped roasted peanuts, and cacao nibs. Stir everything together until evenly distributed.
Pour the mixture into your prepared slow cooker, spreading it out evenly with a spatula.
Cover the slow cooker and set it to cook on low for about 4-5 hours. The bars are done when firm to the touch.
Once cooked, turn off the slow cooker and allow the bars to cool in the cooker for about 30 minutes. Carefully remove and slice into bars.
For an extra touch, melt a tablespoon of peanut butter and drizzle it over the sliced bars.
