Step 1

Heat oven to 375°F. In large bowl, stir together butter, oil, chopped rosemary, garlic, salt and pepper.

Step 2

Add potato slices to butter mixture; toss to thoroughly coat slices. Pick up potatoes by the handful, and place slices 1 on top of another, forming a small stack. Place potato stack on its side in ungreased 8-inch square (2-quart) baking dish. Continue making small stacks with remaining potatoes and arranging them side-by-side in dish to form 3 rows of tightly packed stacked slices. Scrape bowl for any remaining butter mixture, and spread over potatoes.

Step 3

Bake 1 hour. Sprinkle with Parmesan cheese. Bake 15 to 20 minutes longer or until potatoes are fork-tender and golden brown on top. Garnish with sprigs of fresh rosemary. Let stand 10 minutes before serving.