Mash the bananas: In a large bowl, mash bananas until mostly smooth with a few small lumps.
Whisk in wet ingredients: Add eggs, Greek yogurt, vanilla, and maple syrup. Whisk until combined.
Add dry ingredients: Stir in oats, whole-wheat flour, baking powder, baking soda, cinnamon, and salt.
Mix just until no dry streaks remain. The batter should be thick but spoonable.
Fold in chocolate chips: Gently stir in the chocolate chips. Let the batter rest 5 minutes to hydrate the oats and thicken slightly.
Preheat the pan: Heat a nonstick skillet or griddle over medium heat.
Lightly grease with butter or oil.
Cook the pancakes: Scoop 1/4 cup portions onto the pan. Spread gently to about 4 inches wide. Cook 2–3 minutes, until bubbles form on top and edges look set.
Flip and finish: Flip and cook 1–2 minutes more, until golden and cooked through.
Lower heat if browning too quickly.
Serve warm: Top with sliced banana, a drizzle of maple syrup, or a dollop of yogurt.