Triple Vanilla Bean Bars

Bahan-bahan (25 porsi)

• ½ cup (1 stick) salted butter
• 10 ounces (1⅔ cups) white vanilla baking chips
• 1¼ cups all purpose flour
• ¾ cup granulated white sugar
• 1 teaspoon vanilla extract
• ¼ teaspoon salt
• 3 large eggs
• ½ whole vanilla bean, (scraped)
• 1½ cups powdered sugar
• 3 tablespoons salted butter, (at room temperature)
• ½ teaspoon vanilla extract
• 1 to 2 tablespoons milk or cream
• chocolate chips + shortening ((for drizzle on top, optional... see NOTES below))