Place the walnuts in a small dry skillet over medium heat and toast for 3-5 minutes until fragrant and golden, then set aside.
In a high-speed blender, combine the rolled oats, vanilla protein powder, eggs, baking powder, cinnamon, and water.
Blend on high for 30-45 seconds until the batter is completely smooth and thickened.
Heat a large non-stick skillet or griddle over medium-low heat and melt the ghee to coat the surface.
Pour the batter into the skillet to form 3 or 4 medium pancakes, cooking for 2-3 minutes until bubbles form on the surface and the edges look set.
Flip the pancakes carefully and cook for another 1-2 minutes until golden brown on both sides.
While the pancakes finish, place the mixed berries and maple syrup in a small saucepan over medium heat, mashing slightly and simmering for 3 minutes to create a warm sauce.
Plate the pancakes and top with the warm berry compote and the toasted walnuts.