6 cups thinly sliced apples 
1 cup granulated sugar, or less if apples are sweet 
1 cup all-purpose flour 
1/2 teaspoon salt 
2 teaspoons baking powder 
1 egg 
cinnamon (1 to 1 1/2 teaspoons) 
1/2 cup butter 

Place peeled and thinly sliced apples in a 13x9x2-inch baking dish. Sprinkle sugar over apples. Combine flour, salt, and baking powder; add egg and mix well until crumbly. Sprinkle flour-egg mixture over the apples; sprinkle evenly with cinnamon. 
Melt butter and drizzle over top of apples. Bake at 350° until apples are tender, and top is browned, about 35 to 45 minutes. Serve hot or cold with whipped cream or ice cream.