In a large mixing bowl, combine the all-purpose flour and the whole-wheat powder. Add in the baking powder, baking soda, salt, and sugar.
In a smaller mixing bowl, whisk together buttermilk, egg, and melted butter.
Add wet ingredients to dry ingredients and stir until combined.
Preheat a large skillet over medium heat and add butter to grease skillet. Add a tablespoon of batter into the heated skillet and flip when browned.
Repeat until remaining batter is gone.
Before serving, gently spoon caviar and a dollop of crème fraîche over each blini. Garnish with fresh herbs.
