What about a Steady Bilberry crumble?
Bilberries, crumble: butter+sugar+wheat flour+some oatmeal, vanilla.
(Bilberry is the European blueberry - i.e. not the North American huge, watery, variant;
a crumble, or smulpaj, is a dessert pie where fruit/berries are put at the bottom of a pie form and then covered with a "crumble" of butter + sugar + wheat flour (+ oatmeal), then often served with vanilla ice cream or whipped cream or vanilla sauce.)
I'm not 100% sure whether it would work in drinking form, but blåbärssmulpaj is delicious!