Don't have a blueberry muffin recipe that I have tried. However, I have tried
this recipe for raspberry coffee cake. It's low cal and tastes DELICIOUS! You'll never know it was low cal. I substituted 1 cup of blueberries but that turned out to be too much. If you want a bunch of blueberries in every bite, then use 1 cup. Otherwise, I'd use 1/2 to 3/4 cup max. All other amounts were based on the recipe. Good luck!