In a bowl, mash the banana with a fork until you have a paste. Add the maple syrup, peanut butter and milk and whisk to combine.
Add the flour, baking powder, salt and cinnamon. While the flour is sitting on top of the wet ingredients, lightly mix the baking powder, salt and cinnamon into the flour to help distribute it before folding the dry ingredients into the wet ingredients underneath.
Mix until you have a fully combined but slightly lumpy batter, then stop mixing it. Let the batter rest for 5-10 minutes.
Heat a non-stick pan over medium heat. Lightly oil the pan or use a little non-stick cooking spray, if needed.
Scoop approximately 1/4 cup portions of the batter into the pan.
Evenly add a few spoonfuls of diced strawberries or other berries to each pancake.
Once there are a few bubbles in the middle of each pancake and the edges are starting to look dry and cooked, flip and cook for another minute or two.