Preheat oven to 350 degrees F.Unwrap Pillsbury crescents and separate into 4 rectangles. Pinch the seams closed, and cut each rectangle into 8 squares (32 squares total). Lightly spray a mini muffin tin with non-stick cooking spray and gently press the crescent squares into each muffin cup. Set aside.In a small bowl combine the leftover mashed potatoes, cheddar cheese, ranch dressing, about ¾ of the crumbled bacon, and about ¾ of the green onions. Stir to combine.Scoop about 1 tablespoon of filling into each crescent cup. Bake for 15-17 minutes or until the crescents are golden brown and cooked through. Let cool slightly before removing to serving plate. Add a little touch of sour cream to each cup, and sprinkle with remaining bacon and green onions. Serve warm. Enjoy!