• Preheat the oven to 350 ℉.
• Use extra butter to grease an oven proof (serving) dish that holds roughly 2-3 quarts. [A 13x9 pan will also work.] 

Filling:

• Peel and core apples. Cut into thick slices, place in a large bowl. 
• Combine sugar, cinnamon and flour. Sprinkle over cut up apples. Stir to coat apples with sugar mixture.
• Pour the apples into your greased dish, layering them as necessary so that they all fit. [Keeping some gaps between the individual slices allows for the topping to seep into the filling while it cooks. This results in 'caramelized wonderfulness.']

Topping:

• Combine all of the dry topping ingredients together in a bowl. 
• Dice the butter into small cubes and add it to the dry topping mix. 
• Sprinkle the topping over the apples.
• Bake for roughly 20 minutes 'until the apples are done' ...until the dish is bubbling hot.