Apex domains cannot have CNAME records.
Question and response
Question
dig greengiantcompleteskilletmeals.com. NS
Answer
greengiantcompleteskilletmeals.com. 5 NS ns-899.awsdns-48.net.
greengiantcompleteskilletmeals.com. 5 NS ns-1925.awsdns-48.co.uk.
greengiantcompleteskilletmeals.com. 5 NS ns-384.awsdns-48.com.
greengiantcompleteskilletmeals.com. 5 NS ns-1227.awsdns-25.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0