Get a boost of fiber and omega-3 by stirring ground flax seeds into a hearty casserole, chili, or stew. Substitute ground flax for breadcrumbs in ground meat dishes like meatballs, tacos, and meatloaf. Add ground flax seeds to the batter of muffins, breads, cookies, and cakes. Flaxseed can easily replace oil or shortening in a recipe because of its high oil content.