Preheat oven to 350°. In a large skillet, cook bacon and onion over medium heat until bacon is crisp; drain. In a large bowl, combine remaining ingredients; stir in bacon mixture. Transfer to a greased 13×9-in. baking dish.
Bake, uncovered, 35-40 minutes or until a knife inserted near the center comes out clean. Let stand 10 minutes before cutting.