Milk is Indisputably Liked by Kids Act of 2023 or the MILK Act of 2023 This bill revises requirements for milk provided by the National School Lunch Program of the Department of Agriculture. Currently, schools participating in the program may provide lactose-free and flavored and unflavored milk. Under the bill, these schools must offer students flavored milk and maintain the discretion to offer lactose-free milk and unflavored milk.