Cream butter and cream cheese, add egg yolks, mix well. Add lemon rind and vanilla. Sift dry ingredients together. Add oatmeal to cream cheese mixture and mix in by spoon.
Chill dough at least 2 hours. Then roll thin (1/4”) on a slightly floured board. Cut into 2 1/2” circles. Place on cookie sheet and make indentation in center with thumb and fill with about 1 teaspoons of filling such as Solo brand.
Bake 20 minute at 350 degrees. When cool sift powdered sugar over them.
**Rather than roll out the dough, I use a little scoop, then roll the dough balls in flour. Then place on cookie sheet. Flatten out with bottom of a flat bottom glass and make indentation with a small bottle cap. You can sprinkle fine ground nuts or coconut over the filling after they baked so the kolachy doesn’t stick together when you store them.