-- 2 large, firm apples (Cooking Light
recommends Pink Lady or
Honeycrisp)-- Cooking spray — 4 tablespoons brown sugar, divided — 2 1/2 tablespoons butter, melted and divided — 3/4 teaspoon ground cinnamon, divided — 2 tablespoons old - fashioned rolled oats — 1 teaspoon all - purpose flour — 1/4 teaspoon kosher salt — 1 1/2 cups low - fat vanilla ice cream