01 - 
                Set your oven to 350°F (175°C). Cover a baking tray with a silicone mat or baking parchment.
              
              
              
                02 - 
                Stir together the sugar, peanut butter, egg, and vanilla in a mixing bowl. Keep mixing until it turns into a thick, lump-free dough.
              
              
              
                03 - 
                Scoop out a tablespoon of the dough and turn it into a ball. Spread the balls out on your tray, leaving about 2 inches in between. Press each with a fork to make a crisscross design.
              
              
              
                04 - 
                Pop the cookies in the oven for roughly 8-10 minutes. The edges should be firm while the centers stay a little soft—they’ll firm up as they cool.
              
              
              
                05 - 
                After baking, leave the cookies on the tray for about 5 minutes. Then, set them on a rack to cool completely.