I don't know if these are from Mirro but they sound great!

Whipped Shortbread

1 pound butter
1 cup powdered sugar
1 teaspoon vanilla
pinch salt
1/2 cup cornstarch
3 cups flour

Preheat oven to 350 F. Cream together butter, icing sugar, vanilla and salt. Gradually add cornstarch and flour. Whip with an electric mixer until fluffy. Place into a cookie press and press out cookies on cool baking sheet. Decorate with candied cherries or dragees if desired. Bake 12-15 minutes. Let cool for 2 minutes on baking sheet, then remove to wire rack to cool completely. Store in an airtight container at room temperature.