Cinnamon Apple Crumble Cake

Name: Cinnamon Apple Crumble Cake
Cuisine: European, British
Ingredients: For cinnamon streusel crumb; 1 and 1/2 cups flour; 1/2 cup brown sugar; 1/4 cup granulated sugar; 1/2 teaspoon salt; 1 teaspoon cinnamon; 1/4 teaspoon nutmeg; 1/2 cup butter -melted; 1/2 teaspoon vanilla; 1 large (or 2 small) tart apples-peeled and chopped; 4 Tablespoons butter; 1/2 cup granulated sugar; 1 large egg; 1 teaspoon vanilla; 1/2 cup sour cream; 1 cup flour; 1/4 teaspoon baking soda; 1/4 teaspoon salt; 1/2 teaspoon baking powder; 1/2 cup powdered sugar; 1 and 1/2 – 2 Tablespoons apple cider