Dough:

Combine all-purpose flour, baking powder, salt, margarine and water in a large bowl. Mix well. Add additional flour gradually if dough is too moist and hard to work with.

Filling:

Combine shredded apples, sugar and vanilla extract in a small bowl. Set aside.

Assemble:

Roll dough into a 11x17 inch rectangle. 

Spread the apple mixture evenly over the dough. 

Roll the dough, from the long end, jelly roll style. Slice the roll into 1-inch slices. Place the apple buns close together into two (9-inch round) glass baking dishes.

Syrup:

Combine water, sugar, brown sugar, margarine and cinnamon in a small pot. Stir over low heat until all ingredients are melted.

Pour syrup over apple buns.

Preheat oven to 350° F. Bake 1 hour. Serve warm.