Russian Potatoes Recipe

In a large skillet, saute onions in oil and 1/3 cup butter until softened. Stir in sugar. Reduce heat to medium-low; cook, stirring occasionally, for 40 minutes or until deep golden brown. Meanwhile, place potatoes in a large saucepan and cover with broth. Bring to a boil. Reduce heat; cover and cook for 15-20 minutes or until tender. Drain potatoes; transfer to a large bowl. Add 1 cup sour cream, the cream, eggs, dill and remaining butter. Beat until mashed. Spread half of potatoes into a greased 13-in. x 9-in. baking dish; layer with onions and remaining potatoes. Gently spread remaining sour cream over the top. Bake, uncovered, at 350 ° for 30-35 minutes or until a thermometer reads 160 °.