In a large bowl, combine whole wheat flour, rolled oats, brown sugar, baking powder, baking soda, and salt.
In a separate bowl, whisk together buttermilk, egg, melted coconut oil, and vanilla extract.
Pour wet ingredients into dry ingredients and stir gently until just combined; do not overmix.
Heat a non-stick skillet or griddle over medium heat and lightly grease with coconut oil.
Pour 1/4 cup batter for each pancake onto the skillet and cook until bubbles form on the surface, about 2-3 minutes.
Flip the pancakes and cook for another 2 minutes until golden brown and cooked through.
Serve pancakes warm topped with fresh mixed berries and a drizzle of honey if desired.