Add the mashed bananas, eggs, oats, Greek yogurt, baking powder, vanilla extract, cinnamon, and salt to a blender.
Blend on high speed for 30-45 seconds until the mixture is smooth and well combined, with no visible oat pieces remaining.
Let the batter rest for 5 minutes to thicken slightly while you heat a griddle or large skillet over medium heat.
Lightly grease the cooking surface with coconut oil or butter, then pour 1/4 cup of batter for each pancake.
Cook for 2-3 minutes until bubbles form on the surface and the edges look set, then flip and cook for another 2 minutes until golden brown.
Serve immediately or let cool completely and freeze between layers of parchment paper for up to 2 months.