Step 1: Prepare the Baking Dish - Grease a 9x13 inch baking dish with oil or butter, or line with parchment paper.
Step 2: Melt the Peanut Butter Mixture - In a large mixing bowl, combine peanut butter, maple syrup (or honey), and unsalted butter (or coconut oil). Microwave or use a double boiler, stirring until smooth. Add vanilla extract if using.
Step 3: Incorporate the Rice Cereal - Add crispy rice cereal and sea salt to the melted mixture. Stir gently until coated.
Step 4: Spread the Mixture in the Dish - Transfer the mixture into the baking dish and press down evenly with a spatula.
Step 5: Melt the Chocolate and Butterscotch Chips - In a microwave-safe bowl or double boiler, melt chocolate chips, butterscotch chips, and 2 tablespoons of unsalted butter until smooth.
Step 6: Pour the Topping Over the Cereal Base - Pour the melted mixture over the pressed cereal base and spread evenly.
Step 7: Chill to Set - Refrigerate for 1-2 hours until the topping is firm.
Step 8: Slice and Serve - Remove from the dish, slice into squares or bars, and enjoy!