1. Place a large skillet over medium-low heat to start warming up.
2. Zest and juice the lemons into a glass measuring cup (fish out any seeds that may have fallen in). Then, add enough milk to reach 3/4 cup total of liquid.
3. Pour milk/lemon mixture into a mixing bowl and add egg, maple syrup, and olive oil. Whisk to combine. Add all remaining ingredients (flour, baking powder, salt, blueberries), and stir with a spoon until just combined.
4. Increase the heat on your skillet to medium, and grease the pan with butter. Use a 1/2 cup dry measuring cup to scoop as many pancakes as will fit onto the pan. Cook for about 2 minutes per side, or until starting to bubble on top and brown on the bottom, then flip and cook another 2 minutes. Repeat with remaining batter until all pancakes are cooked. Serve immediately, topped with maple syrup and butter, if desired.
5. Leftover pancakes keep well in the fridge for up to 5 days. I recommend reheating them in your toaster or on a pan to get them warm and crisp again.