What I used:
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Pure Stevia Powder from Amazon
Walnuts and Cashew Butter from Aldi
To store: keep refrigerated in an airtight container for 2 weeks, or frozen for 2 months.
Sweetener Swap: you can replace the pure stevia powder with your choice of low-carb equivalent of 3 Tbs sugar. Always taste the dough and adjust to your liking.