Line an 8x8-inch square baking pan with parchment paper, ensuring an overhang for easy removal.

In a large mixing bowl, whisk together the rolled oats, protein powder, ground flaxseeds, and sea salt until homogeneous.

Integrate the creamy peanut butter and honey into the dry mixture using a heavy-duty spatula.

Mix until the dough is thick, sticky, and all dry ingredients are fully hydrated.

Incorporate the mini dark chocolate chips evenly throughout the dough.

Transfer the dough to the prepared pan and compress firmly into an even layer using the bottom of a flat measuring cup.

Lift the parchment paper to remove the slab and immediately slice into 12 rectangular bars.