Here is a recipe from the recipe book that came with my cookie press years ago:
BASIC SPRITZ COOKIES
1/2 cup butter or margarine, softened
1/4 cup vegetable shortening
3/4 cup granulated sugar
1 large egg
2 teaspoons vanilla extract
1/4 teasponn baking powder
1/4 teaspoon salt
1. With electric mixer, beat butter, shortening thoroughly.
2. Add sugar gradually, continuing to beat about 5 minutes until light, fluffy.
3. Add egg, vanilla; beat well.
4. Lightly spoon flour into measuring cup; level off; blend flour, baking powder, salt together; add in 3 additions; mix well after each addition; dough will be stiff.
5. Fill & assemble gun; use desired cookie disc; make cookies.
6. Bake 10-12 minutes at 375 degrees or until just starting to turn light golden around edges, being careful not to overbake.
7. Makes 6-7 dozen cookies.