Preheat oven to 450 and grease a baking sheet with cooking spray. Set aside.
Add bisquick, sour cream and egg to a bowl and mix until combined. Melt butter and cool before adding in with other ingredients and mix until incorporated (do not over-mix).
Using a 3 tablespoon portion scoop (small cookie scoop), scoop batter onto prepared baking sheet, keeping them 2" apart.
Bake for 12-14 minutes or until biscuits begin to brown on top. Remove from oven and let stand five minutes before serving warm.
You can brush more melted butter with a sprinkle of garlic salt on the top to add even more flavor.