Put paper cups into a muffin tin (12 muffins).
Preheat oven to 400F.

In one bowl mix:
1 egg
1 cup of milk
1/4 cup of oil (I use olive oil)
1 cup sugar

Then mix in:
2 cups of flour
3.5 tsp baking powder
1/2 tsp salt

Mix it all really good.

For blueberry muffins add:
Lemon zest to taste (I use a whole lemon, then cut the lemon up for tea)
1 cup frozen or fresh blueberries (I use frozen wild blueberries which are smaller in size)

For chocolate chip muffins add:
1 cup milk chocolate chips

Bake at 400F for about 25 minutes.
Makes 12 muffins.