Combine all the dry ingredients in a large mixing bowl.
With your hands, work the cubed butter into the dry mix until it's thoroughly incorporated and the consistency of breadcrumbs.
Using a spatula, make a well in the center of the dry ingredients and pour the buttermilk and vanilla extract into the center. Gently fold until all ingredients are mixed.
Fold in the blueberries and lemon zest until everything is evenly distributed.
Use your hands to form 12 dough balls. You may need to brush your hands with flour to keep them from sticking.
Optional: Brush the tops of each scone with heavy cream and sprinkle with sugar!
Bake at 400° for 10-15 min. Mine were good around 12 min.