A Quick, Yummy, Healthy (somewhat!) Apple Crisp

I remember my mom making this recipe when I was young. It made the house smell wonderful, and we usually ate the entire dessert in one (1) sitting. Here's the scoop:

First peel and slice about 5 Granny Smith apples. Make sure you slice them rather thin. This should yield you about 5 cups. Place them in a 2 quart baking dish and sprinkle 2-4 tablespoons of white sugar on them.Then in a separate bowl mix 1/4 cup of flour, 1/2 cup packed brown sugar, 1/4 teaspoon cinnamon, and 1/2 cup of oats. After mixing them add 4 tablespoons of melted butter and pour over the dry mixture. Using a fork, mix until it looks like crumbles.Lastly, sprinkle the crumbly mixture over the apples and back for 30-35 in a 375 degree oven. Let cool. Eat. Repeat.
Keep in mind that while the main ingredient is apples, eating too much just might make your tutu a tad too tight for your upcoming dance recital! Beware!