Blend the eggs, banana and pumpkin pie spice in a blender until smooth.
Heat a large nonstick skillet or griddle over medium-low heat. Working in batches, drop silver-dollar portions of the batter (about 1 tablespoon) onto the skillet and cook until golden brown, 1 to 2 minutes per side.
If using a regular skillet or griddle, melt 1 tablespoon butter in the skillet before cooking the pancakes. Add additional butter if needed between batches, about 1 tablespoon more.