In a medium bowl, whisk together flour and baking powder. Set aside.
In Large bowl, with mixer on low speed, add soft butter, shortening, sugar, vanilla and salt. Add peanut butter.Mix on low until well incorporated, about 2 minutes.
Crack eggs into a small bowl, whisk and add them to the mixture. Continue to mix on low-medium until smooth. About one minute.
Turn off mixer and switch to a large spoon. Fold in the flour-baking powder mixture until well-combined. Press dough into bottom of bowl and place in refrigerator. Cover with wrap and Chill for 30 minutes.
Preheat oven to 350 degrees.
IN Tablespoon size scoops, drop balls onto baking sheet two inches apart.
With fork, press gently into the tops, once going each direction like Tic Tac Toe.
Bake for 8 minutes.
Remove from oven and let cool on pan.