Heat the oven to 400 degrees.
Combine the flour, sugar, baking soda, salt and baking powder into a large bowl. Stir well.
Add 7 tablespoons butter, milk and sour cream into the flour mixture. Stir well.
In a small bowl, crack the egg and lightly whisk. Add the egg into the biscuit batter. Stir well to combine.
Add the scallions, bacon and cheddar to the dough. Stir well to combine.
Using an ice cream scoop (or two spoons) out dollops of dough onto a parchment or silpat lined baking sheet. Place the biscuits about 1/2 inch a part.
Brush 1 tablespoon of melted butter on top of the biscuits.
Place the biscuits into the oven and cook 13-15 minutes (or until the biscuits are golden and cooked all the way through).
Remove from the oven and place on a cooling rack. Serve warm.