Preheat your oven to 350 degrees and prep a square baking tin with parchment paper or buttered foil
Whisk the flour, baking powder, baking soda and salt together in a bowl and set aside.
Beat the peanut butter and butter together till luxuriously smooth
Add sugars and beat well for about 1-2 minutes
In go the eggs one by one, beat 30 seconds between additions then add the vanilla extract.
Gradually add the flour and beat until just combined.
Add the peanuts + chocolate/peanut butter chunks/chips and mix just enough to disperse, i.e. a few seconds.
Bake for 35-45 minutes, just until a toothpick comes out mostly clean.
Give it 5 minutes then remove the parchment/ foil from the pan and set the blondies aside on a rack to cool down
Cut into squares and serve
