12. Saying a blessing with food, or other item, in one’s mouth:[1]

See chapter 2 Halacha 7 for the full details of this matter!

It is forbidden to say a blessing while food, or any item, is in one’s mouth and it must hence be removed, as explained in Chapter 2 Halacha 7. Nonetheless, Bedieved one fulfills the blessing if he did not do so.

Began eating a food and then remembered that did not say a blessing: See Halacha 13.

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[1] Brachos 51a; Yerushalmi Brachos 6:1 [44b]; Michaber 172:2 regarding one who forgot and began eating a food without a blessing; M”A 172:4; Taz 172:2; Ketzos Hashulchan 5:10 “It is forbidden to say a blessing with food in one’s mouth”; Beir Heiytiv 173:3; M”B 173:7