Preheat oven to 350°F (175°C). Line an 8x8-inch pan with parchment paper.
Mix oats and protein powder in a large bowl.
In a small bowl, whisk together melted butter and maple syrup.
Pour the wet ingredients into the dry ingredients and stir until combined.
Spread half of the mixture into the prepared pan, pressing down firmly.
Spread the cherry berry preserves evenly over the base layer.
Top with the remaining oat mixture, gently pressing it down.
Bake for 20 minutes until set and lightly golden.
Let cool completely before slicing into bars.