My daddy owns a grocery store...
 

...and in it he sells something that starts with: C M

(foods only, no brand names, no stupid answers like "chicken meat")

No stupid answers? I'm outta heeere......

Let me clarify: The rule is if you are starting a round.
You can't make people guess for "chicken meat" or something that nobody ever says, just to make it harder.
It has to be a food item that actually exists, and as a courtesy, something that people have generally heard of.

Cat Manure?
Cheesey Macaroni?
Creamy Margerine?

custard mix?
cake mix?

Edited to add S S:

No, no, no. No, no.

You don't get to start a new one until you guess the current one.

cute, Mexican cashiers?

Wait, that would be cmc...

Chocolate Milk

No, it's not chocolate milk.

Corn meal would be another good guess, but it's not that either.

You might think Chex Mix, but that's a brand name! No brand names!

Corn muffins

curry marmalade

No, no. :::chuckle:::@"curry marmalade"

Cosmo magazine. Oh, wait, that's a brand.

Cream of mushroom?

No, no. Cosmo isn't a food either.

coconut macaroons?

Good guess! But that's not it.