Line a 13x9” pan with parchment paper or foil, leaving some to hang over the edges to help remove the treats from the pan later. Spray with nonstick spray and set aside. Pour your cereal into a large bowl and set this aside too.
In large pot, melt butter over low heat. Add marshmallows and stir until completely melted. Add in the peanut butter and continue stirring until the mixture is smooth. Remove from heat and stir in vanilla extract and salt.
Pour the mixture over the cereal and stir until completely coated. Plop this into your prepared pan and, using buttered hands, pack into the pan. If you don’t like getting your hands messy, spray the bottom of a measuring cup (or whatever you got) with nonstick spray and use it to press the cereal mix into the pan. Don’t forget the corners!
In a microwave, in 30 second bursts, or over a double boiler, melt the chocolate and peanut butter chips. Spread over the cereal mixture with an offset spatula. Make pretty swirly designs if you want. Sprinkle with flaky sea salt if you are so inclined. I was.
Allow to cool on the counter for at least 2 hours, or until chocolate is fully set. With a sharp knife, cut into pieces and share with your friends and loved ones. If you want.