In a medium bowl, whisk together the flour, oats, whey protein, sugar, baking powder, baking soda, and salt.
In another bowl, whisk the egg, milk, yogurt, oil or butter, vanilla, and maple syrup until smooth.
Pour the wet ingredients into the dry. Stir gently until combined. Do not overmix.
The batter should be thick but pourable; add a tablespoon or two of milk if it’s too stiff.
Let the batter rest for 5–8 minutes. This hydrates the oats and activates the leaveners for fluffier pancakes.
Heat a nonstick skillet or griddle over medium heat. Lightly grease with butter or oil spray.
Pour 1/4 cup batter per pancake.
Cook until the edges look set and bubbles form on top, about 2–3 minutes.
Flip and cook another 1–2 minutes, until golden and cooked through. Adjust heat if they brown too fast.
Serve warm with fresh berries, a smear of peanut butter, a drizzle of maple syrup, or a dollop of yogurt.