Potatoes And Onions Au Gratin

• 8 c. thinly sliced onions
• 1 1/2 sticks unsalted butter or margarine
• 2 lb. baking potatoes, peeled and cut into 1/8-inch slices
• 2 c. heavy cream
• 1/2 c. freshly grated Parmesan cheese
• 1/2 c. grated Gruyere cheese

1. In a large skillet, cook the onions with salt and pepper to taste in 6 tablespoons butter over moderate heat, stirring occasionally, until they are golden.
2. Spoon half the onions into a buttered 4-quart gratin dish; cover them with the potato slices, then sprinkle with salt and pepper.
3. Cover the potatoes with the remaining onions; pour the cream over the mixture and sprinkle the mixture with the combined cheeses.
4. Dot the top with the remaining 6 tablespoons butter and bake the gratin in a preheated 400u0b0 oven for 30 minutes or until tender and golden brown.

onions, butter, baking potatoes, heavy cream, freshly grated parmesan cheese, gruyere cheese

Taken from www.cookbooks.com/Recipe-Details.aspx?id=915005 (may not work)