Better Than Mom's Brown Butter Rice Krispie Treats

1. Line a 9x13 inch baking dish with parchment paper.2. Add the butter to a large pot set over medium heat. Allow the butter to brown lightly until it smells toasted, about 2-3 minutes. Stir often. Remove from the heat and stir in the marshmallows, stirring until melted. Stir in the vanilla, salt, and brown rice krispies, tossing well to combine. Spread the mix out into the prepared pan, packing it in tightly. 3. Let the treats cool, at least 1 hour. Cut into bars and serve! Bars will keep for 2-3 days stored in an airtight container.