1. Preheat oven to 350 degrees F (175 degrees C).

2. Melt the butter in a skillet over medium heat, and cook the onion and garlic 5 minutes, until onion is tender. Remove from heat, and season with salt and pepper.

3. In a large bowl, mix the onion and garlic, beef, crumbled bread, crushed crackers, egg, sour cream, Worcestershire sauce, and 1/2 can tomato sauce. Gradually stir in the milk 1 teaspoon at a time until mixture is moist, but not soggy. Transfer the mixture to a 5×9 inch loaf pan.

4. Bake uncovered in the preheated oven 40 minutes. Increase oven temperature to 400 degrees F (200 degrees C), and continue baking 15 minutes, to an internal temperature of 160 degrees F (70 degrees C).

5. In a small bowl, mix the remaining tomato sauce and ketchup. Pour over the top of the meatloaf, and continue baking 10 minutes.