Preheat the oven: Set it to 350°F (175°C). Line a baking sheet with parchment paper or a silicone mat.
Mix the dough: In a bowl, combine 1 cup smooth, unsweetened almond butter, 1/2 cup granulated keto sweetener, and 1 large egg. Stir with a spatula until thick and uniform.
If using, add 1/2 teaspoon vanilla and a pinch of salt.
Shape the cookies: Scoop about 1 tablespoon of dough per cookie. Roll into balls and place them 2 inches apart on the sheet. Gently press the tops with a fork in a crisscross pattern to flatten to about 1/2 inch thick.
Bake: Bake for 8–10 minutes, or until the edges are set and just turning golden.
The centers will look slightly soft—this is good.
Cool completely: Let the cookies cool on the baking sheet for 10 minutes, then transfer to a rack. They firm up as they cool.
Enjoy: Serve once cooled, or chill for a firmer, chewier bite.