In a large bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, nutmeg, and ginger.
In another bowl, mix the buttermilk, egg, brown sugar, and vanilla extract until well combined.
Pour the wet ingredients into the dry ingredients and stir until just combined. Fold in the grated carrots and walnuts.
Heat a skillet over medium heat and lightly grease it. Pour ¼ cup of batter for each pancake. Cook until bubbles form on the surface, then flip and cook until golden brown.