Preheat oven to 350 degrees. Butter four individual ramekins and set aside.
In a medium bowl, combine the apples, 1 tbsp brown sugar, and 1 tsp ground cinnamon. Toss to make sure the apples are coated.
In another medium bowl, combine the 1/2 cup brown sugar, oats, flour 1/2 tsp ground cinnamon, salt, and butter. Using your hands or a pastry cutter, crumble everything together until the butter is the size of peas.
Divide the apple mixture into the ramekins and add a generous amount of the butter mixture over the top of the apples.
Place the ramekins on a cookie sheet and bake for 30-35 minutes until bubbly and golden brown.
Serve warm with a scoop of ice cream (optional).