Preheat oven to 350 degrees F (175 degrees C). Place apples in a 9x13 inch baking dish.

In a bowl, mix melted butter, flour, sugar, oats, and 1 tablespoon cinnamon to form a crumbly mixture. Sprinkle over apples.

Dot with remaining 1/4 cup butter, and sprinkle with remaining 1 tablespoon cinnamon.

Bake 50 minutes in the preheated oven, until lightly browned and apples are tender.