In medium bowl whisk together flour, salt, baking soda and baking powder. Set aside.
In a large bowl cream together shortening, butter, coconut oil, white sugar and brown sugar.
Mix in egg, egg yolk, and vanilla extract.
Gradually add flour mixture into wet mixture until combined.
Fold in chocolate chips.
Cover bowl and chill dough for 1 hour (I know, this part sucks)
Preheat oven to 375. F.
Line cookie sheet with parchment paper.
Roll two tablespoons of dough into a ball. (I use two scoops using a mini ice cream scoop)
Place on cookie sheet.
Press additional chocolate chips into the dough balls for a nice appearance once baked.
Bake for 7-8 minutes on the middle rack. (May need more or less time so watch very carefully after 5 minutes)
When the edges are barely golden, remove from oven and let cookies sit in pan for 2-3 minutes. (cookies will appear under done. They will firm up nicely as they cool which will result in a soft, chewy cookie)
Remove from pan and place cookies on a cooling rack to finish cooling.
Store in airtight container.