Preheat oven to 475 degrees. Prepare potato pancake batter as per package directions. Allow to thicken and add 1 tablespoon of vegetable oil. Stir. Generously spray 2, 8-inch round baking pans with Manischewitz® extra virgin olive oil spray. Pour 1/2 batter into each and bake for 20 minutes or until edges turn brown and crispy. Turn and bake 15 minutes or until pancake is tan. Take out of oven and cool. Meanwhile in large skillet heat up vegetable oil, enough to cover bottom in thin layer. Saute chopped onion until light brown, adding more oil if needed. Add sliced mushrooms and continue to saute until dark brown. Add chopped meat and cook until browned. Place one pancake on a round serving plate. Spread meat mixture evenly. Cover with second pancake. Dot top with marinara sauce. Cut 6 pie portions and separate so you can place a small bowl of the heated sauce in the center. Dip Sloppy Moses into sauce or pour over meat mixture.