Cranberry Apple Pie

Name: Cranberry Apple Pie
Prep time: 30 min
Total time: 30 min
Cuisine: American
Ingredients: 3 c. all-purpose flour; 1/4 tsp. baking powder; 1 tsp. kosher salt; 1 c. shortening, cut into chunks; 1 tbsp. white vinegar (or apple cider vinegar); 6 tbsp. ice water, divided; 2 egg whites, divided; 1/2 c. butter; 3 tbsp. all-purpose flour; 1/4 c. water; 1/2 c. white sugar; 1/2 c. packed brown sugar; 1 tsp. cinnamon; 1/4 tsp. nutmeg; 1/4 tsp. allspice; 4 Granny Smith apples, peeled, cored and sliced; 2 c. fresh cranberries; Coarse sugar, for sprinkling (optional)