01 - Combine milk, spinach, eggs, melted butter, and vanilla extract in a blender. Blend until completely smooth and vibrant green, ensuring no spinach pieces remain.
02 - Whisk together flour, sugar, baking powder, baking soda, and salt in a large bowl until evenly distributed.
03 - Pour the spinach mixture into the dry ingredients. Stir gently until just combined; do not overmix as a few lumps are acceptable and prevent tough pancakes.
04 - Heat a non-stick skillet or griddle over medium heat. Lightly grease with butter or oil.
05 - Pour 1/4 cup of batter per pancake onto the skillet. Cook for 2–3 minutes until bubbles form on the surface and edges appear set. Flip and cook for another 1–2 minutes until golden and cooked through.
06 - Repeat with remaining batter, greasing the skillet as needed between batches.
07 - Serve pancakes warm with maple syrup and additional butter if desired.