Preheat your oven to 350 degrees.
Line a 9×13 inch aluminum pan with parchment paper and set aside.
In a large mixing bowl or stand mixer, combine the melted butter and dark brown sugar until fully incorporated.
Next, add in peanut butter and combine until smooth.
Mix in the eggs + egg yolk until creamy. Lastly add in vanilla until fully incorporated.
Using a spatula, fold in the flour mixture until fully combined and smooth.
Fold in all the candy toppings until fully combined.
Pour your batter into your parchment lined baking pan and spread until smooth. Top with additional toppings.
Bake blondies for 30-40 minutes, checking at 30 minutes with a toothpick. You should see a few wet crumbs. If your batter is still extremely wet, bake for an additional 5-10 minutes, checking again with a toothpick each additional 2 minutes.
Let your blondies cool in the pan on the counter completely before removing and cutting.
TIP: Do not over-bake! When in doubt (if you keep checking and you just aren’t sure at 40 if they are done or not), simply remove from the oven and let sit in the pan until fully cooled. Over-baked blondies become dry = no bueno. Like any baked good, we steer on the side of under-baked (which always creates an ooey gooey delicious treat!)
