Start by lining a 9x9 inch baking pan with parchment paper, leaving some overhang for easy removal later.
In a medium saucepan over low heat, combine the unsalted butter, brown sugar, honey, creamy peanut butter, and vanilla extract. Stir occasionally until the mixture is smooth and well combined, about 3-5 minutes.
In a large mixing bowl, combine the quick oats, crispy rice cereal, chopped pretzels, and mini chocolate chips. Mix them together until they are evenly distributed.
Pour the melted mixture over the dry ingredients and stir until everything is well coated.
Transfer the mixture to the prepared baking pan. Use a spatula to press it down firmly into an even layer.
Place the pan in the refrigerator for at least 2 hours, or until the bars are set and firm to the touch.
Once set, lift the granola slab out of the pan using the parchment overhang. Place it on a cutting board and cut it into bars or squares as desired.