Can you use frylight sunflower spray instead of butter in baking? Or is it just to grease tins?
It is really just to grease tins. You could use it for spraying some foods (like the top of a breaded food before you put it in the oven, or potatoes or veggies that you want to crisp up in the oven). As an ingredient for cooking, no, it is not appropriate. It would be extremely difficult to get the proper amount measured for baking, and the taste would not be as pleasant because of the propellants used in the can. You would also be hard pressed to get enough actual oil out of the can to be a worthwhile baking ingredient. If you’re looking to replace oil in a pinch, please consider apple sauce, butter, margarine, fruit spread, or even water before the cooking spray.