Easy No-Bake Chocolate and Condensed Milk Truffles. The recipe calls for plain, vanilla-scented "Marie Biscuits" but French-style Petit Beurre are pretty much the same thing. In the US, Vanilla Wafers would probably work as well. (UK use rich teas)
Cookalong Recipe: For some reason this is known in the Antipodes (and I got this recipe from a Kiwi) as Russian Fudge and, although I like this name better, I feel that it perhaps leads the rest of us to expect something altogether more exotic, when this is the plain, comforting, yet temple-achingly sweet, confection of my childhood.