Treat yourself to some delicious and easy to bake Blueberry and Polenta muffins this weekend. You will be so pleased you did. Blueberries are the perfect fruit to add to a muffin batter because of their colour, flavour and size, and even though blueberries aren't grown around here in North Queensland, except for a few native bushes that people might grow, I used frozen ones, and they worked perfectly.