Preheat oven to 350°F (175°C) and line a heavy-gauge baking sheet with parchment paper or a silicone mat.

In a medium mixing bowl, combine the peanut butter, granulated sweetener, egg, vanilla extract, and salt.

Stir the mixture vigorously with a spatula until the ingredients emulsify into a thick, cohesive dough.

Using a tablespoon or small cookie scoop, portion the dough into 12 equal spheres (approximately 30g each) and place them on the prepared sheet.

Apply a fork to the top of each dough ball to create a traditional criss-cross pattern, compressing the cookie to a uniform 1/2-inch thickness.

Bake for 10 to 12 minutes until the edges exhibit slight browning while the centers remains soft.

Remove from heat and allow the cookies to cool completely on the baking sheet for 15 minutes to ensure structural setting.