In a large bowl, mash the ripe bananas until smooth with just a few small lumps remaining.
Add the melted butter, milk, eggs, and vanilla to the mashed bananas, whisking until well combined.
In a separate bowl, whisk together the flour, sugar, baking powder, and salt until evenly combined.
Gently fold the dry ingredients into the wet mixture, stirring just until combined. A few small lumps are good.
Fold in the mini chocolate chips, distributing them evenly throughout the batter.
Let the batter rest for 5 minutes while you heat a griddle or large non-stick skillet over medium heat.
Lightly grease your heated cooking surface with butter or cooking spray.
Using a ¼ cup measure, pour batter onto the hot surface, leaving space between pancakes for easy flipping.
When bubbles form on the surface and the edges look set (about 2-3 minutes), gently flip the pancakes and cook for another 1-2 minutes until golden brown.
Transfer cooked pancakes to a warm plate and continue with remaining batter.
Serve warm with a pat of butter, pure maple syrup, and additional sliced bananas or chocolate chips if desired.