In deep mixing bowl, whisk egg white until soft peaks form. Beat in cream of tartar, xanthan gum, vanilla, and 1 Tablespoon Steviva Blend. Gradually beat in the 3 Tablespoons vanilla whey protein powder. The consistency should be thick and sticky like a marshmallow cream. Set aside.
In medium heavy saucepan, melt butter over medium-high heat. Mix in ¼ cup Steviva Blend and heavy cream. Once it reaches a boil, cook and stir 5 minutes more. Pour into sticky egg white mixture then add in peanut butter and vanilla. Mix until well combined; stir in peanuts. Spread into a 7×11 pan lined with waxed or parchment paper. Cool in refrigerator.
In Pyrex or metal bowl over pot of simmering water, melt chocolate chips with the peanut butter, stirring until smooth. Pour melted chocolate over peanut butter caramel mixture and spread evenly to cover top.
Refrigerate for at least an hour before cutting into squares. Keep in the refrigerator for snacking.