Preheat your oven to 350F
Place a sheet of parchment paper on a cookie sheet
In a medium bowl, sift the all purpose flour, and add in the baking soda and salt. Sifting the dry ingredients is very important
In a large bowl, Cream the sugar and butter together until well blended. You can use a large spoon or fork.
Mix in the egg, egg yolk, peanut butter and vanilla
Gradually add the flour mixture (dry mixture) to the wet ingredients and stir until blended.
You will end up with a soft peanut butter cookie dough batter
Chill the cookie dough in the refrigerator for 1 hour and 15 minutes
Using a 1.5 tbsp cookie scoop roll the cookies in your hand and then place the cookie balls on the parchment paper, making sure to space them apart
Using a fork, press the fork tines into the cookie dough once, and then change direction and press the fork tines again, creating a cross hatch pattern.
Sprinkle the cookies with a small amount of white sugar before they go into the oven
Bake for 8 to 10 minutes until dry and golden around the edges, but soft in the middle. IMPORTANT: The cookies will keep baking on the cookie sheet after you have removed them from the oven.
TIP: Tear a sheet of parchment paper to get the next batch of cookies ready to bake - and use a second cookie sheet if you have one or be ready to switch over once your first batch comes out of the oven.
Let the cookies cool, and of course after sampling one or two :) you can store them in an airtight container. We use large ziplock bags and keep them in the fridge.
You can also freeze your cookies for up to 3 months.