pistachio cinnamon morning buns - Pass the Cookies

Ingredients

• 1 cup whole milk, room temperature (70°F)
• 1 large egg, room temperature
• 1 large egg yolk, room temperature
• 2¼ teaspoons instant yeast
• 4 cups plus 1½ tablespoons flour, plus more for dusting
• ⅓ cup sugar
• 1 cup plus 4½ tablespoons unsalted butter, softened and divided
• 1 tablespoon coarse salt
• ½ cup unsalted butter, melted and divided
• ⅓ cup sugar, plus more for dusting
• ½ cup packed dark brown sugar
• 2 tablespoons ground cinnamon
• ½ teaspoon course salt
• ⅔ cup chopped pistachios
• 1 cup sugar
• 1 tablespoon ground cinnamon