Cook the onion and beef.
Warm the olive oil in a large pot or Dutch oven. Add the diced onion and cook until softened, then add the ground beef and cook until browned.
Add the seasonings.
Stir in the garlic, red pepper flakes, 1 teaspoon of kosher salt, oregano, and tomato paste. Cook briefly so everything becomes fragrant and well combined.
Build the broth.
Pour in the pasta sauce, diced tomatoes, and chicken broth. Bring the mixture to a boil.
Add the noodles.
Stir in the broken lasagna noodles and the remaining teaspoon of salt. Lower the heat and simmer until the noodles are tender.
Make it creamy.
Stir in the heavy cream. Add a little extra broth if you want a looser, soupier texture.
Serve with toppings.
Ladle into bowls and finish with ricotta, mozzarella, Parmesan, and fresh basil.