In a large bowl, beat butter and peanut butter with an electric mixer on medium to high speed for 30 seconds3.
Add the granulated sugar, brown sugar, baking soda, baking powder, and salt. Beat until combined, scraping sides of bowl occasionally with a rubber spatula.
If necessary, cover and chill dough in the fridge about 1 hour or until easy to handle.
Drop cookies by scooping them out of the bowl with a spoon dropping them in small balls onto your greased cookie sheets.