Preheat oven to 325 degrees. 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 greased 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.