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Line an 8" x 8" baking dish with parchment paper. Leave some overhang to use as handles to lift the fudge out when it's ready.
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Put a large pot over medium heat and melt the butter.
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When it's all melted, add the peanut butter and cookie butter. Stir until fully dissolved and incorporated.
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Add the vanilla extract and cardamom and stir.
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Add the powdered sugar and stir until well incorporated. It should be a big semi hard ball. Just, work it until it's well mixed and most of the large white spots are gone.
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Put the fudge into the baking dish and smooth it out with a silicone spatula. Refrigerate for 2 hours.
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When the fudge has set, grab the parchment paper handles. Lift it out and transfer to a cutting board. Cut into inch and a half squares.