Preheat the oven to 350 degrees F.
Grease a 9x13-inch pan.
Mix the flour, the graham cracker crumbs, the oats, 1/2 cup of the brown sugar, and the sugar.
Stir in the melted butter.
Reserve 1 cup of the crumb mixture for the topping, pressing the remaining crumb mixture onto the bottom of the prepared pan.
Bake the pan until the crumb crust is set, about 8-10 minutes.
Cool the crust on a wire rack.
Mix the apples, the cinnamon, the ginger, the cloves, and the remaining brown sugar together.
Spread the apple mixture over the crust.
Sprinkle the apples with the reserved crumb mixture.
Bake until the apples are tender, about 30-35 minutes.
Let the bars cool completely on a wire rack.
Mix together the confectioners' sugar and the milk.
Drizzle the glaze over the dessert.
Cut the dessert into bars and serve.