You can but you might get slightly inconsistent results. Butter is made up of milk fat, water, and milk solid particles, and store bought butter brands use very precise ratios that are hard to intentionally replicate at home. Depending on the brand of heavy cream, how well you rinse the butter, how much salt you add, etc. your homemade butter can vary wildly. That doesn't mean you can't use it for baking, it just means it's not going to be as reliable as store bought butter. That said, I've been using my homemade butter to make biscuits without a problem.