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Preheat your oven to 350.
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Mix together all the dry ingredients in a small bowl.
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In a different bowl, whisk together for a couple minutes the cookie butter, egg, egg yolks and vanilla.
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Add the dry ingredients to the wet ingredients. Use your hands to really combine all the ingredients. Dough should be a little sticky. If you find the dough too dry, add 1/2 tbsp of milk at a time to the mixture.
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Line your cookie sheet with parchment paper. Then, take the dough and shape it into a long rectangle about 2 inches thick.
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Bake for 20 minutes. Dough should be mostly set with a set edges. Remove from the oven and let sit for 5 minutes.
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Reduce temperature to 300F. Slice your dough into half inch pieces and place back onto the parchment paper. Bake for another 20 minutes or until your desired level of golden color.