Instructions: Using electric mixer, cream butter with sugar in large bowl. Add yolks and vanilla an beat until light and fluffy, about 3 minutes. Add flour, poppy seed and salt and blend well. Cover and chill overnight.

Preheat oven to 375. Form dough into 1-inch balls. Arrange on ungreased baking sheets, spacing about 2 inches apart. Let soften several minutes at room temp. Make indentation in center of each using thumb. Bake cookies until lightly browned, 12 to 15 minutes. Transfer to racks. While still warm, press center again with thumb. OPT:)Just before serving, fill centers with jelly.

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