Preheat oven to 350°F.
Stir together apples, 1/4 cup of brown sugar, cinnamon and lemon juice; pour into a 1 1/2 quart baking dish.
Cut flour, oatmeal, remaining brown sugar and margarine together with a pastry blender or fork in a medium bowl; sprinkle over apple mixture.
Bake until apples are tender and top is browned, about 45 minutes.
Find any recipe, add your own, make grocery lists easily from recipes. Enter any 3 ingredients and BigOven will tell you what you can make. It's free! (4.5/5 stars)