Preheat the oven to 350 degrees and line an 8x8 baking dish with parchment paper.
Add the bananas to a mixing bowl and mash with a fork. Add the oil, sugar, maple syrup & vanilla and whisk until mostly smooth. Pour in the peanut butter and whisk again. Pour in the protein powder and oats and mix until combined. Add the chocolate chips and gently fold in.
Transfer the mixture to the prepared baking dish and spread in an even layer - top with a few more chocolate chips if you want.
Place in the oven, on the center rack, for 30 minutes. Remove from the oven and allow to cool for 5 minutes. Grab the edges of the parchment paper and lift up the whole thing to transfer it to the counter to cool for another 30 minutes.
Slice into 9 squares and enjoy!
Video
Notes
If your coconut oil is hard, just put it in a microwave safe container and microwave for 30 seconds to soften.
Old fashioned or quick oats work, but I would avoid steel cut.
The chocolate chip measurement is just a suggestion - I prefer to measure with my heart.
If you aren't going to use protein powder, add another 1/2 cup of oats instead.
I have made these with and without coconut oil. It definitely still works without the oil, but it just adds a nice creaminess to the bars.