In an earlier era when Christians gave up meat, dairy products, and eggs for all of Lent, eating these things again at Easter was a very exciting and special occasion. So it became customary to bring these foods to church in a basket on Holy Saturday for the priest to bless. Then families would bring the baskets home to share the feast.  Read more about it here:  https://aleteia.org/2022/04/15/the-beautiful-tradition-of-blessing-the-easter-basket/