Millionaire Bars

Bahan-bahan (20 porsi)

• ½ cup cold butter (cut into pieces)
• 1 cup all-purpose flour*
• ⅓ cup granulated sugar
• ¼ teaspoon kosher salt
• ⅔ cup brown rice flour
• ⅓ cup tapioca starch
• 3 tablespoons potato starch
• ½ teaspoon xanthan gum
• ½ cup butter
• 14 ounces sweetened condensed milk
• 2 tablespoons brown rice syrup or corn syrup
• 1 teaspoon vanilla extract
• ¼ teaspoon kosher salt
• 2 cups semi sweet or dark chocolate chips
• 1 tablespoon butter
• Optional: kosher (course sea salt, or Maldon salt (if you have it))