Preheat oven to 350 degrees and line cookie sheet with parchment paper
In a medium bowl, mix until combined the flour, baking powder, and salt; set aside
In a standing mixer, beat together the butter, peanut butter, 3/4 C sugar, brown sugar, eggs, and vanilla until light and fluffy
Gradually beat in the dry ingredients until dough forms
Using a small ice cream scooper, scoop dough into 2 tbsp scoops onto the cookie sheet
Roll into balls
In a small bowl, mix together the remaining 3/4 C sugar and 3 tbsp ground cinnamon
Roll each ball in the cinnamon-sugar mixture
Place cookie dough balls onto the cookie sheet and bake for 13 minutes
Allow cooling before enjoying!