1. Preheat oven to 350 degrees Fahrenheit. Sift flour, salt, and baking powder into a bowl and set aside.
2. In the bowl of a mixer fitted with the hook or paddle attachment, add the eggs, sugar, oil, juice, zest of the orange and vanilla. Beat until everything is combined.
3. Slowly add in the dry ingredients and continue mixing until the mixture forms a ball. Put in plastic wrap and place in the refrigerator for about 20 minutes to an hour.
4. In the meantime prepare the filling and topping.