This delicious fall dessert recipe starts with in-season granny smith apples and a crispy oat topper. Our testers preferred the tart flavor of granny smith but you could substitute your favorite baking apple, like honey crisp apples, to make this homemade apple crumble recipe. Ingredients 1/2 cup granulated sugar 1 Tbsp. cornstarch 1/4 tsp. salt 1/2 tsp. ground cinnamon 6 medium granny smith apples, peeled, cored, and chopped into bite-sized pieces 1 Tbsp. lemon juice 1 cup all-purpose flour 1 c