Blessing on a Cake with Ice Cream on Top

There is a dessert based on a cake with ice cream on top. Should one bless it at the end of the meal?

If there is a large layer of ice cream, it is appropriate to separate and bless the ice cream independently as 'Shehakol'. If it is a thin layer of ice cream, since one does not bless the cake due to the doubt whether it is considered 'Pat Haba Bekisnin', as it is kneaded but not crumbly or filled. The ice cream is secondary to the cake, and therefore, one does not bless even on the ice cream.

Mishna Berura, Siman 168, S"K 45: "And it is clear that only when they are baked together, but if the honey cakes are baked separately and then the jam is placed on top, the jam does not become secondary to them, as the intention is to eat both. And the jam does not come to accompany the honey cakes, and one must bless also on the jam." The poskim wrote that only when the jam is a thick and significant layer can it be said that the intention is to eat both, and one must bless on both, but when the jam is a thin spread, one does not bless on both, only on the honey cakes. Here, since one does not bless the cake due to doubt, one does not bless even on the ice cream.