In a medium bowl, whisk together buttermilk, whole milk, pumpkin, egg, oil and vanilla.
In a large bowl, combine the flour, brown sugar, baking powder, baking soda, pumpkin pie spice and salt.
Stir dry ingredients into the pumpkin mixture until just combined. Fold in toasted pecans.
Heat a lightly oiled griddle or nonstick frying pan over medium high heat.
Pour or scoop the batter onto the griddle, using approximately 1/3 cup for each pancake. Cook until surface of pancakes have some bubbles and a few have burst, about 1 to 2 minutes.
Using a thin spatula, carefully flip each pancake and cook until browned on the underside, about 2 minutes more. Transfer cooked pancakes to a baking sheet and keep warm in oven.
Continue with more oil and remaining batter.
If desired, top with additional toasted pecans, butter and high quality maple syrup.