Apple Butter Bars with Maple Glaze!

Name: Apple Butter Bars with Maple Glaze!
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: American
Ingredients: 8 tablespoons unsalted butter, at room temperature; 1 cup dark brown sugar, packed; 1 large egg, at room temperature; 1 teaspoon vanilla extract; 1 1/4 cups flour; 1/2 teaspoon baking powder; 1/4 teaspoon kosher salt; 1 1/2 teaspoons apple pie spice; 1/4 cup chopped crystallized ginger; 1/2 cup apple butter; 1 cup confectioner's sugar; 1 tablespoon maple syrup; 1/2 teaspoon vanilla extract; 1 - 2 tablespoons milk