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Line a loaf pan (8x4 inch or 5x9 inch) with waxed paper.
In a medium saucepan over low heat, combine the peanut butter and butter. Stir until melted, then stir in the vanilla extract.
Whisk in the sweetener and collagen until well combined and smooth. Pour the mixture into the prepared pan and refrigerate until set, about 1 hour.
Lift the waxed paper out by the edges and cut the fudge into 15 pieces.