Melt the butter over low heat. Add the allulose and erythritol. Bring the mixture to a very gentle boil and cook until it reaches 310 degrees.
Stir in the baking soda. The mixture with look "fluffier" and change texture.
Stir in the peanuts and pure vanilla.
Spread the mixture onto a parchment-lined baking sheet. Cool and break into pieces.
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