Make pomegranate juice reduction: Bring pomegranate juice to a boil over moderately high heat. Boil for 20-30 minutes, stirring occasionally, until the juice has reduced.
2 cups pomegranate juice
Preheat oven to 375°F.
Make the topping: Pour the cake mix into a large bowl. Reserve 1/4 cup of the cake mix and set aside. Whisk in the oats, baking powder, baking soda and salt until combined.
1, (15.25 oz. box) yellow cake mix, divided, 1 cup old-fashioned oats, 1/4 tsp. baking powder, 1/4 tsp. baking soda, 1/2 tsp. salt
Cut cold butter into the dry ingredients using a pastry cutter or 2 knives until the mixture resembles coarse crumbs, with some pieces the size of small peas.
1/2 cup unsalted butter, cold, cubed (8 Tbsp.)
Stir in the cold heavy cream just until combined. Place in fridge.
1/2 cup cold heavy cream, plus more for brushing
Peel and slice the apples into 1/2 inch thick slices. Place in a large bowl. Pour pomegranate reduction over apples. Stir to combine.
4-5 large Granny Smith apples, peeled, halved, cored and sliced 1/2 inch thick
Add in sugar, reserved cake mix and a pinch of salt. Stir again.
1/2 cup sugar
Pour apples into a glass 9x13 inch baking dish. Gather the cake mix topping into small clumps and scatter over the apple filling.
Brush the tops with cold cream, and a sprinkle generously with coarse sugar.
Bake for 35-40 minutes or until cobbler is bubbling and tops are golden brown. Tent with foil if the crust begins to brown before the cobbler is done.
Remove from oven and let cool for 15-20 minutes before diving in.
Garnish with pomegranate arils if desired and serve warm with a scoop of ice cream.
pomegranate arils, ice cream