Coat a 13" x 9" baking dish with non-stick cooking spray.
Combine the Rice Krispies, oats, and nuts in a large mixing bowl. Set aside.
Combine the brown sugar, corn syrup, and honey in a small saucepan over medium heat. Heat just until boiling, then remove from heat and stir in peanut butter, vanilla, and salt until smooth. Pour over the dry mixture and mix well. If necessary, coat hands with non-stick cooking spray and use your coated hands to combine well. Add chocolate chips, mixing a bit more to distribute throughout.
Press the mixture down evenly into the prepared baking dish using the back of a large spoon or a piece of wax paper.
Allow to cool, then cut into bars. Store covered.