Place blackberries and sugar into a small saucepan over medium low heat. Stir occasionally for about 10 minutes. Pour into a sieve placed over a small bowl pressing on berries to extract the rest of the liquid. Set aside; discard smashed berries and seeds.
Place butter, sugar and buttermilk into a separate small saucepan over medium heat. Stir and melt until mixture comes to a low boil. Remove from heat and add in baking soda and vanilla. Mixture will foam. Mix in blackberry liquid then pour syrup into a serving dish. Cover to keep warm while preparing waffle pancakes.
For the Pancakes:
Whisk eggs, buttermilk, butter and vanilla into a medium bowl until well combined. In a separate bowl, sift the flour, baking powder, salt and sugar. Mix into wet ingredients until just combined.
Place waffle pancake pan (or large skillet) over medium heat and spray with cooking spray. When hot, pour a couple Tablespoons into each waffle mold. Carefully flip after 1-2 minutes or until browned on bottom. Cook second side until golden brown. Continue to cook until all batter is used.
Stack waffle pancakes and pour LOTS of syrup over top, enjoy!