PREHEAT oven to 375°F. Mix stuffing mix with half of each of the pasta sauce and oregano. Add meat; mix well. Pat into 8-inch square baking dish.
MIX zucchini, mushrooms, remaining pasta sauce and remaining oregano. Spoon evenly over meat mixture; cover with foil.
BAKE 35 min. Uncover. Layer the top with bacon and sprinkle cheese on top. Bake another 10 minutes or until meatloaf is cooked through (160°F). Cut into four pieces to serve.