Preheat the oven to 350°F (175°C) and line a large baking sheet with parchment paper.
In a medium-sized mixing bowl, combine the almond butter, keto sweetener, and the egg.
Stir the mixture vigorously with a spatula or use a hand mixer until a thick, cohesive dough forms.
Using a standard tablespoon or cookie scoop, portion the dough and roll into approximately 1-inch balls.
Place the balls on the prepared baking sheet, spaced 2 inches apart.
Use the tines of a fork to press down on each ball in a criss-cross pattern, flattening them to about 1/2-inch thickness.
Bake for 10 to 12 minutes until the edges are just set and slightly golden.
Remove from the oven and allow the cookies to cool completely on the baking sheet for at least 10 minutes to reach final structural integrity before moving.