Preheat your oven to 375°F (190°C).

Boil the diced potatoes in salted water until tender, about 15-20 minutes.

Drain the potatoes and return them to the pot. Add butter, sour cream, half of the cheddar cheese, salt, and pepper. Mash until smooth but slightly chunky.

Fold in chopped green onions and bacon bits.

Spread the mixture into a greased baking dish. Top with remaining cheese and extra bacon bits if desired.

Bake for 25-30 minutes until bubbly and golden brown.