Make oat flour if needed. If using rolled oats, blend them into a fine flour.
Measure after blending so amounts are accurate.
Whisk the wet ingredients. In a large bowl, whisk together pumpkin puree, eggs, milk, Greek yogurt, vanilla, and maple syrup until smooth.
Add the dry ingredients. Stir in protein powder, oat flour, all-purpose flour (if using), baking powder, pumpkin pie spice, and salt. Mix until just combined. The batter should be thick but pourable.
Rest the batter. Let it sit for 5 minutes.
This allows the oats and protein to hydrate and the baking powder to activate.
Heat the pan. Warm a nonstick skillet or griddle over medium heat. Lightly grease with oil or butter.
Cook the pancakes. Pour about 1/4 cup batter per pancake. Cook until bubbles form on top and the edges look set, 2–3 minutes.
Flip and cook another 1–2 minutes until golden and cooked through.
Adjust as needed. If pancakes are browning too fast, lower the heat. If the batter thickens as it sits, stir in a splash of milk.
Serve warm. Top with Greek yogurt, maple syrup, almond butter, chopped nuts, or a few chocolate chips. A sprinkle of cinnamon is great too.