Funfetti Frosted Blondies

Bahan-bahan (18 porsi)

• 1 cup (2 sticks) butter, (melted)
• 2 cups packed brown sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• ½ teaspoon salt
• 2 cups all purpose flour
• ¼ cup large rainbow sprinkles ((they won't dissolve as quickly in the batter as the small ones))
• ¼ cup (½ stick) butter, (softened)
• 3 cups powdered sugar
• 2 teaspoons vanilla extract
• 2 to 3 tablespoons milk
• 1 tablespoon rainbow sprinkles