Hassleback Baked Apples

Name: Hassleback Baked Apples
Ingredients: 1 apple (peeled, cut in half); 2 tbsp butter (divided); 2 tbsp brown sugar (divided); 3/4 tsp cinnamon (ground, divided); 1/2 tbsp rolled oats (old fashioned); 1/2 tbsp all purpose flour; salt (a pinch); 1 scoop vanilla ice cream; caramel (drizzled)