To make and store the dry pancake mix: combine the all-purpose flour, ground rolled oats, whey protein powder, brown sugar, buttermilk powder, cornmeal, baking powder, kosher salt, chia seeds, and flax seeds in an airtight container; seal and store in a cool, dry place.
To make pancakes, place 1/2 cup of the prepared pancake mix in a mixing bowl.
In a separate bowl, whisk together 1/4 cup buttermilk, 1/2 teaspoon maple extract, and 1 large egg until combined.
Add the wet ingredients to the pancake mix and stir gently until just combined; do not overmix.
Heat a skillet or griddle over medium-low heat and brush lightly with canola oil.
Pour batter onto the hot surface 1/4 cup at a time. Cook until small bubbles form on top and edges look set, about 2–3 minutes, then flip and cook until golden brown on the other side, about 1–2 minutes more.
Serve immediately with butter and syrup.