Preheat oven to 325 degrees F.
Mix cashews, walnuts, almond slivers and pumpkin seeds into an 8x12 baking dish (a 9x13 standard size will work fine too)
Bake for 15 minutes.
Meanwhile, add egg whites and sea salt to a medium bowl.
Using hand beaters, beat until foamy.
Add sweetener, Worcestershire, paprika, cayenne and butter.
Mix well.
When nuts are done baking, remove from oven and pour the sauce over the top of them. Stir them up and mix well.
Place back in the oven for 30-40 minutes, stirring halfway through.
Let cool to harden.
Break apart clusters.