Preheat oven to 350°F (175°C).

Peel and slice apples into approximately 6 cups.

In a bowl, mix 2 scant cups of sugar, 3/4 tsp cinnamon, and 2 Tbsp of flour.

Stir the sugar mixture into the sliced apples to coat them evenly.

Transfer the apple mixture into a baking dish.

In a separate bowl, combine 2/3 c. melted oleo, 1 1/2 c. brown sugar, 1 1/2 c. flour (or less), 1 1/2 c. oatmeal (or less), 1/2 tsp soda, and 1/2 tsp baking powder.

Mix the topping ingredients until fairly moistened and crumbly.

Sprinkle the topping evenly over the apples in the baking dish.

Bake in the preheated oven for 30 minutes, or until the apples are tender and the topping is golden brown.

Let cool slightly before serving.

Serve warm, optionally with vanilla ice cream.