Baking Tip #3 → Sour Cream
I cannot stand a dry cake or cupcake. There is nothing more unpleasant than taking a bite and desperately needing a sip of water because the cake feels like it is stuck in your throat. If I wanted to eat a dry dessert, I would have chosen a scone and if you think scones should be moist, you are wrong.
If you want to make sure that you never bake a dry, awful cake, keep reading because I have the ultimate tip for you.
ADD SOUR CREAM!
That’s right. Adding sour cream will ensure that your cake is moist everytime. In most baked good recipes, fats are essential as they provide moisture. Since sour cream is an extremely dense fat, it adds moisture without making the cake too dense.
So, the next time you bake a cake try adding sour cream or look for a recipe that calls for sour cream. Hope this helps!
source: https://www.allrecipes.com/article/why-use-sour-cream-in-baking/