Allow butter to reach room temperature if you can try to use unsalted butter. Cream sugar and butter together until light and fluffy.
Add eggs one at a time and mix well. Add in flour, powdered milk, baking powder, and corn syrup. Beat each in well.
Add the juice of half a lemon, salt, vanilla, nutmeg, and mace. Make sure everything is well blended, and pour into a prepared loaf pan 9" x 5" x 2 1/2.
Bake at 325 degrees for 45 minutes, checking for doneness by inserting a toothpick and seeing if it comes out clean. You almost want to underbake this.