Cook onions in olive oil in a 2-quart saucepan over moderate heat, stirring until onions are softened. Add garlic and cook, stirring, 1 minute.
Add pasta sauce and simmer, uncovered, stirring occasionally, until slightly thickened, about 15 minutes. Fold in chopped fresh basil.
Spread ½ cup sauce in 8 x 8-inch baking dish and top sauce with a layer of Old London® Classic Melba Toast. Sprinkle with mozzarella and Parmesan cheese. Top with a layer of Melba toast. Continuing layering with sauce, mozzarella, Parmesan and Melba toast. Finish by topping with sauce.
Bake lasagna covered with foil in middle of oven for 30 minutes. Remove foil and sprinkle evenly with ½ cup mozzarella. Bake until bubbling and cheese is melted, about 10 minutes more.