Line a 5×9-inch loaf pan with parchment paper.
In a saucepan, combine berries, water, and chia seeds. Bring to a boil, mash the berries, and cook until thickened.
Remove from heat and stir in protein powder until fully combined. Let cool.
In a bowl, mix maple syrup, melted coconut oil, and peanut butter.
Add rolled oats and oat flour. Mix until combined.
Press 2/3 of the mixture into the loaf pan.
Spread the berry-protein jam over the base.
Crumble remaining mixture on top and press lightly.
Refrigerate for 3–4 hours, until set.
Slice into 8 bars and serve. Store in the fridge.