Maple Bourbon Bars

Bahan-bahan (16 porsi)

• 3/4 cup white whole wheat flour (plus 1 tablespoon)
• 1/2 cup all purpose flour
• 1/2 teaspoon baking powder
• 1/4 teaspoon kosher salt
• 6 tablespoons unsalted butter
• 2/3 cup dark brown sugar
• 1/3 cup pure maple syrup
• 1/4 cup bourbon ((if you prefer to omit, decrease white whole wheat flour by 1 tablespoon))
• 1 1/2 teaspoons pure vanilla extract
• 2 large eggs
• 1/2 cup chopped toasted walnuts
• 1 cup powdered sugar
• 2 tablespoons maple syrup
• 1 to 2 tablespoons bourbon (or milk or cream)