This is my all time favorite muffin recipe which I adapted to mimic the Ollieberry and Cream Muffins available at Linn's Resturant in Cambria, CA. You can use any type of berry, fresh or frozen. For the freshest possible muffins, I usually mix the dry ingredients together the night before and finish completing the recipe in the morning when I get up. The muffins do stay moist and tender, however, if you choose to bake them in advance. For a streusel coffee cake, double the recipe and bake it in a 9" by 13" pan until the center pops back when poked.