Preheat the oven to 325°F. Line a baking sheet with parchment paper.
Place the butter in a medium, microwave-safe bowl. Microwave it on high until melted, for about 30 seconds.
Add the stevia, vanilla, and salt. Whisk to incorporate.
Gradually add the almond flour. Mix with a rubber spatula or a fork, and then lightly knead the mixture into a dough.
Scoop the dough onto the parchment paper with a 1.5-tablespoon cookie scoop. Shape each cookie with your hands into a 2-inch-diameter, ¼-inch thick cookie. Space the cookies 1 inch apart. They don't expand much during baking.
Bake the cookies until they turn golden and fragrant, about 12-15 minutes. Don’t overbake - they are light in color when ready, although they do take on a golden hue.
Cool the cookies in the pan for 10 minutes – they will still be soft at this point - then carefully transfer them to a cooling rack and cool them for 10 more minutes before serving.
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Notes
After mixing the ingredients and lightly kneading, you should have a dough that you can easily manipulate by hand. It should be crumbly but not dry. If it’s very dry, add a tablespoon of water.
If using a granulated sweetener instead of stevia, you'll likely need to add some water to make the dough a little less crumbly. Add a tablespoon at a time until the dough is easy to work with.
If you like your baked goods very sweet, use the equivalent of ⅓ cup of sugar.
You can store these cookies in an airtight container at room temperature for up to 3 days. If you'd like to keep them for longer, it's best to freeze them in freezer bags with layers separated by wax paper.