In a small bowl, whisk together flour, sugar, baking powder, 1 tsp cinnamon, and salt. Stir Cinnamon Toast Crunch cereal into mixture.
In a medium bowl, whisk together buttermilk, melted butter, egg, and vanilla.
Slowly pour the dry ingredients into the wet ingredients, stirring until they’re just combined, but being careful not to over-mix.
Heat a griddle or frying pan over medium heat and pour about ¼ C batter onto it. Cook pancakes for about 2 minutes on each side, until they’re nicely browned. Repeat with all batter.
Stir the remaining 1 tsp cinnamon into the maple syrup and serve syrup over a stack of pancakes. Crumble additional Cinnamon Toast Crunch cereal over the top, if you desire.