01 - Whisk together flour, sugar, baking powder, baking soda, and salt in a large bowl.
02 - In a separate bowl, whisk buttermilk, milk, eggs, melted butter, lemon zest, lemon juice, and vanilla extract until smooth.
03 - Pour wet ingredients into dry ingredients and gently mix until just combined; some lumps are acceptable to avoid overmixing.
04 - Carefully fold fresh or frozen blueberries into the batter without overmixing.
05 - Heat a nonstick skillet or griddle over medium heat and lightly grease with butter or oil.
06 - Pour 1/4 cup batter per pancake onto the skillet. Cook 2 to 3 minutes until bubbles form on the surface and edges look set.
07 - Flip pancakes and cook an additional 1 to 2 minutes until golden brown and cooked through.
08 - Repeat with remaining batter, greasing the skillet as needed. Serve warm with maple syrup, extra blueberries, or powdered sugar.