Truvia is indeed a calorie-free sweetener, making it attractive for low calorie dieters. While it is simple to use as a calorie-free sweetener for sprinkling in beverages or on grapefruit, baking with Truvia can be a bit more tricky. Truvia cannot replace sugar cup for cup in baked goods. The manufacturer of Truvia says that you can replace some of the sugar with Truvia in baked products, but for best results it is best to leave at least 1/4 cup of real sugar in your recipe. Real sugar plays an important role other than providing sweetness when you bake with it. Keeping some regular sugar in the recipe will help with browning, spreading, and the structure of the finished baked good. After adding 1/4 cup of regular sugar to your recipe you can replace the remaining sugar with Truvia. You can refer to the manufacturer's conversion chart located on their website to figure out how much Truvia to add. The conversion works out to be about three and a half tablespoons of Truvia to replace every half cup of sugar. Keep in mind that Truvia is sold only in small packets, so you will be using several little packets to achieve the result you want.
Baking with Truvia also requires a cooler oven. According to the manufacturer of Truvia, you should reduce the baking temperature by about 25-50°F, and then increase the cooking time by 5-10 minutes.
Using Truvia can save you some calories in your baked goods, though you should not expect your dish to turn out exactly as it would if you were using actual sugar. And keep in mind that while Truvia is made from a natural ingredient derived from the stevia plant, it has not been approved by the FDA.