Preheat oven to 350 degrees Fahrenheit. In a large mixing bowl combine flour, sugar, baking powder and salt. Stir them with a whisk.
Add eggs, oil and milk to the dry ingredients. Mix well using a whisk.
Gently fold the Blueberries into the mixture. The batter will seem thick.
Grease a 9 x 13 baking pan with butter or cooking spray to keep the cake from sticking to the pan. Spoon batter into the prepared baking pan.
In a small bowl, combine sugar with nutmeg. Stir them with a whisk.
Sprinkle sugar/nutmeg mixture on the top of the batter.
Bake at 350 degrees Fahrenheit for 50 minutes. Allow the cake to cool before cutting.
Serve as desired. Store leftover cake covered, at room temperature for 2 days, or in the refrigerator for up to 5 days. Or, freeze leftover cake for up to 3 months.