Preheat oven to 475°F and heat a 10” cast iron skillet over medium-high.
In a blender cup, measure the oats, vanilla protein powder, sea salt, cinnamon, and baking powder.
Blitz dry ingredients until a powder is formed (10-15 seconds).
Add butter to hot cast iron pan and swirl as it melts, coating the sides of the pan and bottom evenly.
Keep an eye on it as it browns, being careful not to burn. If it starts to take on too much color, move it off the heat.
On top of the dry ingredients, add eggs, almond milk, peanut butter, honey, and vanilla. If the liquid is too high to screw on the lid, pre-mix everything together with a chopstick.
Screw on the lid and blend batter for 10-20 seconds until combined.
Pour batter into buttered cast iron skillet and immediately transfer to preheated oven.
Bake for 20 minutes until golden and firm.
Flip onto a plate and drizzle with real maple syrup.