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Instructions:
- Preheat the oven to 375°F (190°C) and grease a baking dish.
- Place the potatoes in a large pot, cover with salted water, and boil for 18 to 22 minutes, until fork-tender. Drain well.
- Mash the potatoes until smooth, then whip in the melted butter, sour cream, heavy cream, salt, and black pepper until creamy.
- Stir in 1 cup of cheddar cheese, ½ cup of Monterey Jack cheese, half of the bacon, and half of the green onions.
- Spread the potato mixture evenly into the prepared baking dish.
- Top with the remaining cheeses and bacon.
- Bake uncovered for 30 to 35 minutes, until hot, bubbly, and lightly golden on top.
- Remove from the oven and sprinkle with the remaining green onions before serving.
Variations
- Add cream cheese for an even richer, thicker texture.
- Mix in roasted garlic for deeper flavor.
- Use pepper jack cheese for a spicy kick.
- Stir in caramelized onions for extra sweetness.
Tips
- Use russet potatoes for the fluffiest texture.
- Drain potatoes thoroughly to avoid a watery casserole.
- Whip gently with a hand mixer for ultra-smooth steakhouse-style potatoes.
- Let the casserole rest a few minutes before serving so it sets slightly.