Preheat the oven to 350 degrees. Line muffin tins with paper liners.
Sift the flour, sugar, baking powder, baking soda, and salt into a large bowl and mix together. In a separate bowl, mix together the buttermilk, butter, lemon zest, and eggs. Make a hole in the center of the dry ingredients and pour the wet ingredients into the dry ingredients. Mix with a fork just until blended. Fold the blueberries into the batter. Don't over mix! With a standard (2 1/4-inch) ice-cream scoop or large spoon, scoop the batter into the prepared cups, filling them almost full.
Bake the muffins for 20 to 25 minutes, until golden brown.
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