For the Bars
1-1/4 cups all-purpose flour
1 teaspoon baking powder
1/4 teaspoon baking soda
1 teaspoon ground cinnamon
1/4 teaspoon ground allspice
1/4 teaspoon salt
1 stick (8 tablespoons) unsalted butter
1 cup (packed) light brown sugar
2 large eggs
1/2 cup unsweetened applesauce
1 teaspoon pure vanilla extract
1 tablespoon applejack, brandy or dark rum (optional)
1 baking apple, such as Rome or Cortland, peeled, cored and finely diced or chopped
1/2 cup plump, moist raisins (dark or golden)
1/2 cup chopped pecans

For the Glaze
2-1/2 tablespoons heavy cream
1/3 cup (packed) light brown sugar
2-1/2 tablespoons unsalted butter
1 teaspoon light corn syrup
1/2 teaspoon pure vanilla extract