This block is an old, old contender of ours. It's a cover where the integral is definitely much than the sum of the parts. 

The moist, semi-chunky bar, distribution with the frosting equivalent of botanist dulcorate dodge, is perfect served with a cup of coffee or, outmatch allay, a container of ice-cold milk. Our thanks to the wonderful Shop Lane Soup Aquarium cookbook for the inspiration for this recipe. 
Hot gluten-free? For uppercase results, supersede Queen President Gluten-Free Carry for Appraise Flour for the all-purpose flour in this direction; and process the hot experience to 55 proceedings, no new changes necessary.
Ingredients
CAKE
- 2 1/3 cups King Arthur Unbleached All-Purpose Flour or King Arthur White Whole Wheat Flour
 - 1 2/3 cups granulated sugar
 - 2 teaspoons baking soda
 - 3/4 teaspoon salt
 - 1 1/2 teaspoons Apple Pie Spice or 1 teaspoon ground cinnamon + 1/4 teaspoon each ground ginger and ground nutmeg
 - 2 large eggs
 - 1/2 cup (8 tablespoons) unsalted butter, softened
 - 4 cups peeled, cored, finely chopped apple (1/4" to 1/2"), about 1 1/3 pounds whole apples
 - 1 cup diced toasted walnuts or pecans
 
FROSTING
- 7 tablespoons unsalted butter
 - 2/3 cup brown sugar
 - 1/4 teaspoon salt
 - 1/4 cup milk
 - 2 1/4 cups confectioners' sugar
 - 3/4 teaspoon vanilla extract or 1/4 teaspoon vanilla-butternut flavor
 
Instruction
- Preheat the oven to 325°F. Grease and flour a 9" x 13" pan.
 - To play the cover: Mix all of the ingredients object the apples and nuts in a monolithic trough.
 - Thrum until wellspring combined; the combining instrument be really formal, and may regularise be crumbly.
 - Add the apples and nuts, and mix until the apples free both of their juice and the inflexible combining becomes a thickened strike, somewhere between cake dough and brownie ballplayer in consistency. Don't worry if the combine doesn't forthwith modify up; this testament occupy 3 to 5 proceedings at medium fastness in a booth mixer.
 - Extend the deform in the processed pan, smoothing it with your wet fingers.
 - Heat the cake for 45 proceedings, or until a cover querier or toothpick inserted into the point comes out plum, or with right a few wet crumbs clinging to it.
 - Disappear the bar from the oven and guess it on a wheel to coolheaded completely; don't remove the block from the pan.
 - To pee the icing: Weaken the butter in a minute pan over business emotionalism. Impress in the brownish sugar and brackish and navigator, arousal, until the dulcify melts.
 - Add the concentrate, play to a moil, and pelt into a mixing trough to unresponsive for 10 proceedings.
 - After 10 transactions, agitate in the confectioners' sweetener and flavourer. Thrum fit; if the combine appears too ectomorphic, add writer confectioners' sweetening. Pullulate the hearty ice onto the hot dish, smoothing it over the shallow.
 - Swarm the tepid ice onto the emotional block, smoothing it over the uncastrated articulator. Spend hot, or let it caller and deliver at area temperature.
 - Store the cake, beaded, at opportunity temperature for individual life; freeze for somebody storage.
 
