This is a great Thanksgiving and Christmas dessert that everyone will love! Serve warm with vanilla ice cream.
Preheat oven to 350 degrees F (175 degrees C).
Roll cinnamon rolls onto a work surface to desired thickness; press into the bottom of a 9x13-inch baking dish.
Mix oats, brown sugar, flour, 1 tablespoon cinnamon, and salt on a bowl; add margarine and mix until crumbly.
Spread apples over cinnamon roll crust. Mix white sugar and 1 teaspoon cinnamon together in a bowl and sprinkle over apples; top with oat mixture.
Bake in the preheated oven until apples are tender, 40 to 50 minutes.
Place icing in a microwave-safe bowl; heat in microwave until warmed, 20 to 30 seconds. Pour icing over crisp.
Per Serving: 674 calories; protein 6.6g; carbohydrates 115.8g; fat 23.1g; sodium 830.5mg.