For Crumb
2 cups light brown sigar, packed
2 1/4 cups all purpose flour
1 1/2 teaspoon cinnamon
1/4 teaspoon each nutmeg and ground ginger
1/8 teaspoon salt
1/2 cup Heath Toffee bits
8 ounces (2 sticks) butter, melted
For Cake
6 ounces (1 1/2 sticks) butter, at room temperature
1 cup granulated sugar
2 large eggs
1 cup sour cream
1 1/2 teapoon vanilla extract
2 cups all purpose flour
1 1/4 teaspoon baking powder
1/2 tea baking soda
1/8 teaspoon salt
1/4 teaspoon cach ground cinnamon, nutmeg and ground ginger
3/4 cup diced peeled and cored granny smith apple
For Glaze
1 cup confectioner's sugar
about 4 tablespoons heavy cream
1 teaspoon vanilla extract