In a medium bowl, mix flour, ground flax, oats, baking powder, cinnamon and pumpkin pie spice. Set aside.
In a separate bowl, whisk together milk and egg. Add in brown sugar, Greek yogurt, and vanilla extract until smooth.
Gradually add the wet ingredients into the flour mixture, mixing until just combined.
Give your griddle or skillet a chance to heat up over medium heat, and make sure it is well greased.
Scoop 1/3 cup of the batter and pour it onto the hot skillet, allowing the pancake to cook on one side until there are bubbles in the center, about 1-2 minutes per side.
I had to add more cooking spray between each pancake to keep them from sticking.