1. Heat oven to 350 degrees F. Heat oil in small skillet over medium heat. Add onion and cook until softened, 5 minutes. Remove from heat; cool.
2. Combine remaining ingredients except potatoes and beans in large bowl; mix well. Stir in onion. Spoon mixture into an 8x4-inch loaf pan.
3. Bake 45 to 50 minutes or until meat thermometer inserted in center registers 160 degrees F. Cool in pan 5 minutes. Unmold and serve with mashed potatoes and green beans, if desired. Makes 6 servings.