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Preheat oven to 350F. Spray a 9x13-inch casserole dish with cooking spray.
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In a large skillet, combine the onion and bacon and cook until bacon is crisp and onions are translucent. Drain off fat; add garlic and stir for about a minute or until fragrant. Remove from heat and set aside.
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In a large mixing bowl, stir together the remaining ingredients. Add the bacon and stir until combined. Transfer to the prepared casserole dish and bake uncovered for 35-40 minutes or until a knife inserted near the center comes out clean. Let stand 5 minute before serving.