DD's homemade mashed potatoes. They have about 1000 calories a spoonful, I think, but they are delicious- and decadent, full of cream and butter and so so so good!
McDonald's deep-fried hash brown. I don't know how they make them these days, but back in the "early days" they were AWESOME. Salty, crispy, hot; what more could you ask for to start your day? I know they are probably a heart attack in the waiting, but they were so good.
Smashed potatoes. DD uses potatoes about the size of a walnut, bakes them in the oven, smashes them with a glass, brushes with garlic butter, and puts them in the oven to crisp up around the edges.