Preheat the oven to 425°F degrees. Generously grease a 13x18 baking sheet with cooking spray.
In a large bowl, whisk together the flour, sugar, baking powder and salt. Make a well in the center of the dry ingredients and slowly whisk the milk, eggs, melted butter and vanilla extract into the dry ingredients until well combined; some lumps are fine.
Pour the pancake batter onto the prepared pan, spreading evenly.
Sprinkle the chocolate chips in one quadrant, blueberries in another, strawberries in another and finally, bananas in the last quadrant. Bake until golden brown, 15-17 minutes.
Divide into 12 portions and serve immediately with maple syrup, if desired.
