I have been trying to find a muffin worth eating here in Texas. Many of them are way, way to sweet, or they are too dry or they just don't taste good. I have decided that the only solution is to make my own. Sometimes you just want a really good muffin.
I have made this a bunch of times. They are from one of my favorites -- King Arthur Flour -- and they are delicious. I would make a couple of adjustments to the recipe. I think that you could reduce the sugar somewhat. They are not overly sweet, but they could be less sweet, especially if you want them as a breakfast treat, so I might go down to a little more than half a cup of sugar. Also, you could substitute some of the white flour with whole wheat flour (or white whole wheat flour) if you want them to be a bit healthier. Finally, I thought that 1.5 cups of blueberries was way to many for the amount of batter. I would reduce to one cup and you would have plenty.
I didn't have any sparkling sugar, so they looked good, but they didn't have that sugary crunch. You can find the recipe here.