Preheat oven to 375 degrees F. Line a 12-cup muffin tip with muffin liners and set aside.
Add butter, sugar, eggs, vanilla, and buttermilk to mixing bowl and mix 1 min / speed 3. Add flour, flaxmeal, baking powder, baking soda, and salt and mix 30 sec / speed 5. Use the spatula to fold in blueberries.
Scoop about 1/4 cup of batter into the prepared muffin tin. Sprinkle about 1 tsp of coarse sugar on top of each muffin. Bake for 25-30 minutes, until the tops are light golden brown and a toothpick inserted into the center of a muffin comes out clean.
Remove the muffins from the oven, and after 5 minutes transfer them to a wire rack to cool.
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