Preheat oven to 350 degrees F (175 degrees C). Grease cookie sheets.
In a medium bowl, cream together the butter and brown sugar until light and fluffy. Beat in the eggs one at a time, then stir in the vanilla. Combine the flour, baking powder, baking soda, and salt; gradually stir into the creamed mixture.
Stir in the mincemeat, raisins, and walnuts. Drop by rounded spoonfuls onto the prepared cookie sheets.
Bake for 12 to 15 minutes in the preheated oven, until golden brown. Allow cookies to cool on baking sheet for 5 minutes before transferring to a wire rack to cool completely.
Interesting Facts
Mincemeat cookies are a traditional Christmas treat in the United Kingdom.
Mincemeat is a mixture of dried fruits, spices, and suet.
These cookies can be stored in an airtight container for up to two weeks.