1. Preheat oven to 350 degrees Fahrenheit. Line a muffin pan with 12 cupcake wrappers.
2. In the bowl of an electric mixer, combine sugar and margarine, and cream until combined. Add one egg, incorporate, and then add next egg.
3. Add flour in two batches. Add salt and baking powder. Quickly add lemon juice, zest, and oil, and mix.
4. Divide batter evenly in 12 muffin cups and bake 20 to 25 minutes or until toothpick inserted comes out clean.