Meanwhile, in a large bowl, combine the ground beef, chopped onion, breadcrumbs, garlic, egg, salt and pepper and mix to incorporate all ingredients. Make meatballs and set them aside on a large plate. Heat a pan over medium heat. Stay a bit of olive oil and add meatballs to cook, turning occasionally, until brown on all sides for 5-7 minutes. Stir in wine, gently scraping up brown bits from the bottom of the pan. Stir in marinara sauce, chopped kale, thyme and basil and bring to a simmer. Remove from heat and fold in cooked pasta.