Step #1 In a large saucepan mix the white sugar, brown sugar & water; bring to a boil, lower heat & let simmer stirring for 3 mins (watch closley this will run over the pot easily!).
Step #2 Remove from heat & stir in the vanilla & maple extract; cool to almost room temperature (you can chill for faster cooling) then add to your bottle of store-bought syrup.
Step #3 Seal tightly & put in the fridge.
Step #4 This will last as long as your bottled pancake syrup.