1. Set oven to 375 degrees. 2. Mix together mustard, honey, oil and salt and pepper; add to the potatoes and onion slices. 3. Pour the sauce over potato/onion then toss well coate. 4. Place in a greased baking pan. 5. Bake for 35-40 minutes or until potatoes are tender. 6. Sprinkle fresh parsley over potatoes.