The same applies to wine or any other liquid which is used to cook another food in it, the liquid is a Tafel. (Mishna Berura Siman 205:9-13)
2) Pieces of Chocolate that have nuts in them, or juice that has small pieces of fruits in it, the nuts/pieces of fruit are Tafel to the chocolate/juice, as they are only there to improve the taste of the chocolate/juice. (See
Aruch HaShulchan Siman 212:8 and
Pri Megadim Mishbetzos Zahav Siman 202:14)
Halachos for Shabbos Kodesh
1)A food item that is covered with a different food item, if the outer item has no importance on its own and the food isn't referred to by the name of the outside item, it is Tafel to the food that is inside, and only the Bracha of the inside item is recited.
Conversely, if the outer food does have importance on its own and is often eaten specifically because of the outside, then it does indeed require a separate Bracha, and in many cases can exempt the inside food.
For example: Almonds, peanuts, chocolate etc. that have some sort of sugared confection covering on it which is there to improve the taste of the nut/chocolate, since the main food that is desired is the nut or the chocolate, no separate Bracha is needed on the topping. (See Mishna Berura Siman 204:51. See also Shu"t Be'er Moshe Vol. 1 Siman 7 and Igros Moshe Orach Chaim Vol. 3 Siman 31)
However, for chocolate covered peanuts, or a similar item, where the more important food is the covering, a Bracha is recited on the chocolate and it exempts the peanut that's inside. (see Ben Ish Chai Parshas Pinchas Siman 15 and Ohr L'Tzion Perek 14:64)
2) Peanuts that are covered with a thick dough (commonly referred to in Hebrew as Kabukim), according to some Poskim, since it is a very thick dough, it will retain its status of being a second food in the mixture and not just a covering to the peanut, and since it is Mezonos it will always be the Ikar, and thus Mezonos will be recited when eating these Kabukim. (Psak of Rav Shlomo Zalmen Auerbach Zatzal quoted in Sefer V'Zos HaBracha. See also Shu"t Shevet Haleivi Vol. 4 Siman 161)
Others disagree and maintain that despite its thickness, its only purpose is to serve the peanut and thus it does not have a status of an Ikar, and Ha'Adama is recited.
The best thing, therefore, in situations of doubt is to recite Mezonos on something else and have in mind to exempt the dough part, and recite Ha'Adama and something else and have in mind to exempt the peanut.