Pre-heat the oven to 350F/190C. Line an approximate 15×10 inch / 38×25 cm baking sheet or jelly roll pan
In a medium bowl whisk together the flour, salt and baking powder.
In a large bowl or stand mixer bowl cream the butter and sugar for 2 minutes, add the peanut butter, vanilla and egg and combine. Add the dry ingredients ½ cup at a time, mixing on low, with a spatula or your hands, when almost combined add the chocolate chips and combine. Don't over mix.
Spread the dough on the prepared pan, (I found it easiest to place the dough in the pan and then lay a sheet of parchment paper on top and press down, then remove the paper). Bake for approximately 18-20 minutes or until lightly browned, don't over bake. Cool in the pan on a wire rack. Cut into bars. Enjoy!
Notes
How to store the peanut butter bars.
Keep the bars in an airtight container at room temperature for up to 3 days, or refrigerate for about a week or freeze them by wrapping them tightly and place in a freezer-safe bag or container. Freeze for up to 2 months and thaw at room temperature before serving.