An explanation: I copied this recipe from a KAF New Baking Circle mincemeat thread. Someone was looking for a filled mincemeat cookie, and this post is by Carol (no last name), who took it from an Old Baking Circle thread on mincemeat by tneil; it was never in the recipe section. I will type it in as posted:

Filled Mincemeat Cookies

The recipe for the cookie dough came from "Better Homes and Garden Cook Book, circa 1980/81. The filling is different. For filling I use a jar of nun such [sic] mincemeat, or usually I use a lb. of bulk mince meat. Makes 3 dozen.

3 cups all-purpose flour
1/2 tsp. baking soda
1/2 tsp. salt
1/2 cup butter (one stick)
1/2 cup shortening
1/2 cup granulated sugar
1/2 cup packed brown sugar
1 egg
3 Tbs. milk
1 tsp. vanilla
1 pint Mixed-Fruit mincemeat

Combine flour, soda, and 1/2 tsp. salt. In a separate bowl, beat butter and shortening for 30 seconds. Add granulated sugar and brown sugar and beat until fluffy.

Add egg, milk, and remaining vanilla. Beat well, then add dry ingredients to beaten mixture, beating well.

Divide dough, cover, and chill at least 1 hour.

On lightly floured surface, roll out to 1/8" thickness, cut with 2 1/2" round cutter. Place 1 tsp filling on a round, spread to 1/2" of the edge, cover with another round, and seal with a fork.

Bake on an ungreased cookie sheet 10-12 minutes at 375F.