Baked apples with oatmeal crumb topping

I've made baked apples before, but these are apple halves with essentially an oatmeal cookie crumble topping. Two of these make a lovely breakfast.

From skinnytaste.com:

2 large apples, cut in half
2 tbsp butter, melted
2 tbsp brown sugar
2 tbsp flour
4 tbsp quick oats
pinch of cinnamon

Preheat oven to 350º. Cut apples in half and remove core and seeds with a small pairing knife or spoon.

In a small bowl combine butter, brown sugar, flour, oats and cinnamon. Spoon on top of the apple halves and sprinkle with cinnamon. Place on a cookie sheet and bake in the oven for 30 minutes.