Lightly grease 11 x 7-inch, can use a 13 x 9-inch baking dish but you will have a thinner bar.

In a large bowl combine Rice Krispies cereal, oats, and nuts.

In a saucepan stir the protein and honey until just at a boil.

Immediately remove from heat and stir in the peanut butter and vanilla until well combined.

Pour over the dry ingredients in the bowl; mix to combine.

Transfer the mixture into prepared baking dish, then using slightly wet hands push evenly down into the pan.

While the mixture is still soft, for easier slicing take a sharp knife and slice into desired size bars.

Chill until firm.