01 -
Turn your oven on to 190°C first thing. Then, swipe some grease around a 2-litre dish so nothing sticks.
02 -
Grab your largest mixing bowl. Toss in the sour cream, salt, half the cheddar, black pepper, plus your sautéed shallots and garlic. Fold in those shredded spuds last, just until everything's hanging out together.
03 -
Keep the skins and use your food processor or box grater to tear up those cold, already baked potatoes.
04 -
Warm your butter up in a small pan using medium-low heat. Drop in the shallots, stirring until soft, about 4 minutes. Stir in the garlic, cook just half a minute more, then pull it off the stove.
05 -
Spoon everything gently into your greased dish. Sprinkle what's left of the cheddar up top, then add all the parmesan.
06 -
Pop the dish in for 25 to 30 minutes. Pull it once you see the cheese on top is bubbly and a shiny golden color.