Preheat oven to 450 degrees. Cover baking sheet with parchment paper.
In stand mixture with paddle attachment cream 1/2 cup butter. Add chives and mix until smooth and incorporated. Set aside.
Mix flour, baking powder, baking soda and salt in medium bowl. Cut the 3 tablespoons of butter into the flour mixture with pastry knife until the butter crumbles. Mix the scallions, cheddar and Parmesan into the flour mixture. Pour the buttermilk into the bowl and stir just until combined. Drop by large rounded spoonful’s on to the cookie sheet (approximately 1/4 cup). Brush tops with egg wash. Bake for 13-15 minutes or until golden brown. Serve with chive butter.
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