Apex domains cannot have CNAME records.
Question and response
Question
dig matzohballs.com. NS
Answer
matzohballs.com. 5 NS ns1.matzohballs.com.
matzohballs.com. 5 NS ns2.matzohballs.com.
Authority
The response has no authority records.
Additional
ns1.matzohballs.com. 5 A 193.34.212.3
ns2.matzohballs.com. 5 A 5.181.190.108
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0