Freezing instructions: After spooning into casserole dish, cover and freeze for up to 3 months. Thaw in refrigerator; bake as directed.
Preheat oven to 350°.
Heat oil in a large nonstick skillet over medium heat. Add onion and garlic; sauté 5 minutes or until onion is tender. Stir in remaining ingredients; spoon into a 2-quart casserole. Cover and bake at 350° for 45 minutes or until thoroughly heated.