In a bowl, combine the melted butter, brown sugar, eggs, vanilla extract and 3/4 cup peanut butter. Stir until combined.
In a separate bowl, combine the dry ingredients (flour, baking powder and 1/2 tsp kosher salt).
Fold the dry ingredients into the batter.
Line a 9"x9" square cake pan or casserole dish with parchment paper.
Spread the batter evenly into the pan.
Heat the remaining 1/4 cup peanut butter in the microwave until thinned.
Drizzle the peanut butter and caramel sauce over the top of the batter.
Swirl with a butter knife.
Top with dry roasted peanuts.
Bake at 350F for 30-35 minutes.
Remove from oven and immediately sprinkle with 1/2 tsp kosher salt.
Notes
Bringing cold eggs to room temperature quickly: If you need to bring your eggs to room temperature quickly for this recipe, fill a bowl with hot water from your tap and place the eggs in it for about 5 minutes.
Omitting the caramel sauce: Caramel not your thing? No problem! Simply leave it off or substitute it with a 1/4 cup of something else, like marshmallow fluff.
Testing for doneness: Blondies have reached the perfect level of doneness when a toothpick/cake tester comes out with a few baked crumbs. Because blondies are a moist treat with a fair amount of fatty ingredients, a completely clean toothpick indicates they've likely been overbaked.
Making a large batch: If you'd like to make a larger batch of these blondies, you can double the recipe and bake them in a 9"x13" casserole dish. Simply increase the bake time by 5-15 minutes or until done.
Storage: Blondies can be kept in an air tight container at room temperature for about 3 days.