Cream butter, sour cream, and sugar. Add egg yolks, then flour. Knead with hands until well blended, adding a little more flour if needed.

Divide dough into 6-8 sections, pat each into a flat piece, then chill. Roll out, between waxed paper, each section like a pie crust.

Cut with a sharp knife 4 cross cuts to make 8 triangles. Drop 1/2 teaspoon of prune butter onto each triangle, roll up starting at wide end.

Place on greased cookie sheet. Bake 375 degrees F until light brown. If desired, sprinkle with powdered sugar.

Even though these have very little sugar, they are fabulous. They even give Kolaches some stiff competition.