In a large bow, combine cornmeal, flour, sugar, baking powder, baking soda and salt together. Set aside.
In a medium bowl, whisk buttermilk, eggs, vanilla, sour cream and melted butter together. Add buttermilk mixture to dry ingredients and combine. Let stand for 20 minutes.
In the meantime, combine honey and softened butter in a small bowl. Set aside.
Heat griddle or skillet over medium heat and brush with butter. Ladle 1/3 cup of batter onto griddle and sprinkle with a few blueberries. Cook until golden brown, about 2 minutes on each side. Repeat with remaining batter.
Serve pancakes with maple syrup and honey butter.