- Preheat the oven to 350°F (175°C) and grease a 9×9 inch baking pan.
- In a large bowl, mix together the melted butter and brown sugar until well combined.
- Add the eggs and vanilla extract, and mix until smooth.
- In a separate bowl, whisk together the gluten-free flour, baking powder, and salt.
- Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
- Fold in the pretzel pieces and half of the salted caramel sauce.
- Pour the batter into the prepared baking pan and spread evenly.
- Drizzle the remaining salted caramel sauce on top.
- Bake for 25-30 minutes or until a toothpick comes out clean.
- Let cool before cutting into squares and serving.
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