Picked during peak season, frozen berries are often more delicious than the oversize and expensive ones you find in the produce section of the grocery store outside of your local growing season. Freezing is a good way to preserve flavor and nutrients, so baking with frozen berries is a wonderful way to work antioxidants, vitamin C and fiber into your diet. While it’s true berries are delicate and won’t be as pretty after freezing, this is less important when you’re folding them into batter and baking them into a muffins or bars. In fact, berries are often baked or made into jam when they’re overripe and too soft, so there’s absolutely nothing wrong with using frozen berries for baking.