Mix together the flour, baking powder, and salt and add that to the egg mixture.
Add blueberries last and gently mix the fruit into the batter.
Pour batter about ⅔ full into greased or paper-lined muffin tins. (You can sprinkle sugar or a combination of cinnamon and sugar on top of each muffin if desired. )
Bake at 375° for 20 minutes or until done.
I have made this recipe using a half-pint jar of my home-canned blueberries.
I drain them well before adding them to the batter. (And I save the juice to drink later—it’s so good iced or added to 7Up or ginger ale. )