This recipe comes from the Washington Post, and it is DELICIOUS! I've made rugelach with cream cheese before, but hadn't heard of making it with sour cream. Well, these are by far the best rugelach I've ever made or tasted! They're a bit labor-intensive (as all regelach are, really), but soo worth it! I didn't use all of the filling, but use your discretion. The dough needs 1 to 2 hours' refrigeration time (included in passive work time). STORE: Baked rugelach are best kept between layers of wax paper and loosely covered with aluminum foil (the object is to keep the pastries dry; do not store under a cake dome or closed container). The rich dough freezes well for up to 4 months; freeze unbaked rugelach on a baking sheet until they are firm, then transfer to heavy-duty resealable plastic food storage freezer bags; there is no need to defrost them before baking.