Preheat oven to 375 F.
In a large bowl, stir granulated sugar, flour, salt and cinnamon until blended.
Add diced apples; stir to coat evenly.
Spoon apple mixture into shallow 2 quart glass or ceramic baking dish; spread evenly.
In same bowl: combine flour, oats, brown sugar, butter, soda, and baking powder.
With fingers, mix until coarse crumbs form.
Crumble over apple mixture.
Place sheet of foil underneath baking dish;
crimp foil edges to form a rim to catch any drips during baking.
Bake crisp 35 to 40 minutes, or until top is browned and fruit is bubbly at edges.
Cool on wire rack for 1 hour to server warm or cool completely to serve later, reheat if desired.