Salted Peanut Bars

Preheat your oven to 350°F.
Line a 13x9-inch baking pan with foil, extending the foil over the edges.
For the crust, in a small bowl, stir together the all-purpose flour, very finely crushed pretzels, baking powder, and baking soda.
In a large bowl, beat the softened butter with a mixer on medium to high for about 30 seconds.
Add the brown sugar, egg, and vanilla.
Beat until combined, scraping the bowl as needed.
Beat in the flour mixture.
Spread the dough in the prepared pan.
Bake for 12 to 14 minutes or until it's light brown.
Place the pan on a wire rack.
Meanwhile, in a medium bowl, microwave the marshmallow crème and peanut butter for about 30 seconds or until softened; stir until smooth.
Stir in the powdered sugar.
Spread this mixture over the warm crust, then sprinkle with peanuts.
In a medium heavy saucepan, cook and stir the vanilla caramels and milk over medium-low heat until the caramels are melted and smooth.
Spread the caramel mixture over the peanut butter layer.
Top with chopped peanuts, if desired.
Let it cool.
Using the foil, lift out the uncut bars and cut them into individual bars.