In a large bowl cream together the butter and the sugar.
Mix in one egg at a time.
Add vanilla extract and mix well.
In a separate bowl, mix together the flour, salt and baking soda.
Add the dry ingredients to the wet ingredients gradually, a little at a time. Mix well.
Flour your hands to prevent the dough from sticking and spread on prepared jelly roll pan.
Bake for 12-15 minutes (Do not over-bake or you’ll end up with dry bars).
For the Frosting:
Beat butter until creamy.
Mix in the vanilla and salt.
Add the powdered sugar gradually, mixing well.
Add the milk and mix until it reaches your desired consistency.
Spread the frosting onto the cooled cake bars.
Sprinkle on some nonpareils.
Notes
The best way to tell if these cookie bars are done is to use the toothpick trick. Stick your toothpick into the middle and take it out. If comes out clean, your cookies are ready.
Wait until your cake bars are cool before frosting them so the icing doesn't melt off.
You can either store your cookie bars at room temperature or in the fridge for up to four days. You can also keep these in the freezer for up to three months.