I bought one for 99 cents (you can also get 3 for $2.19).
The Croissant Donut was pretty fresh and warm. They spooned the cinnamon sugar into the bag and gave it a good shaking when I ordered it. It was coated pretty well.
The cinnamon sugar came in moderation and wasn't too heavy. If you prefer powdered sugar (or something else), I'd try asking for one plain and sprinkling some on at home.
Nutritional Info - Jack in the Box Croissant Donut - 1 piece (36g)
Calories - 136 (from Fat - 56)
Fat - 6g (Saturated Fat - 2g)
Sodium - 58mg
Carbs - 18g (Sugar - 8g)
Protein - 2g