Preheat oven to 350°F (180°C). Grease glass baking dish; set aside. Cook pasta according to package directions, reserving 1/2 cup (125 mL) cooking liquid.
In large saucepan, melt butter over medium-low heat; cook onions and thyme for 20 to 25 minutes or until onions are deep golden brown. Crumble sausages; add to pan along with salt and pepper. Cook for 5 or 6 minutes or until sausage is golden brown; drain fat. Add tomato sauce and reserved cooking liquid; bring to simmer. Stir in kale.
Spread 1/4 of the sauce over bottom of prepared dish. Layer 3 lasagna noodles and one quarter each of the remaining sauce, goat cheese and mozzarella over top. Repeat layering three more times, ending with mozzarella.
Cover with foil and bake for 20 minutes; remove foil and bake for 10 minutes or until cheese is golden brown. Let stand for 10 minutes before serving.