Preheat oven to 350 degrees Fahrenheit.

Prepare the filling: Place dates and cinnamon in a small bowl. Cover with boiling water; set aside.

Prepare the topping: In a mixing bowl or closed Ziploc bag, mix all topping ingredients until crumbly.

Cut apples in half horizontally so you have two halves, top and bottom. Using a sharp knife, cut out most of the core, leaving some intact. Arrange apple halves cut-side up in a 9×13-inch pan.

Using the back of a spoon, mash date filling until mostly smooth. Spoon some filling into the center of each apple half. Crumble some topping on top.

Bake uncovered until apples are soft and topping is golden brown, one and a half to two hours.