For us cooks/bakers it’s a favorite because ground flaxseed or also known as flax-seed meal is vegan and can be used as a fat substitute and/or egg substitute in baked goods. That said I wouldn’t suggest omitting the fat in a baking recipe and using all flaxseed meal instead. It doesn’t work like that. The taste and texture of the baked treat will have to be compromised then. So start with small quantity, see how you like it and gradually use flax seed meal to replace about 1/3rds of the amount of oil/butter used in the original recipe.