In a medium-sized bowl, mix together the oats, ½ cup flour, powdered sugar, baking soda, baking powder and salt.
Whisk in the eggs, buttermilk, and vanilla and mix well.
Add additional flour if needed, then stir in the toasted pecans.
Preheat a buttered griddle over medium heat.
Mix together the topping ingredients.
Pour 1/2 cup of batter onto hot griddle and cook for 2 minutes, or until the pancakes start to bubble.
Flip pancakes and cook an additional 1 to 2 minutes, or until both sides are brown.
Spread hot pancakes with butter, sprinkle with topping ingredients, and drizzle with warm maple syrup.
Eat and enjoy!