Can aspartame be used in cooking or baking?

Yes. Low-calorie sweeteners containing aspartame can be used in a wide variety of recipes. In recipes requiring lengthy heating or baking, a loss of sweetness may occur. Therefore, it is best to use tabletop sweeteners with aspartame in specially suggested and tested recipes. If a food containing aspartame is heated for too long, it would still be safe but will simply not provide the desired sweetness.