Cook the Pasta: Begin by boiling water in a large pot. Add salt and then your choice of pasta. Cook according to package instructions until al dente. Drain and set aside.

Caramelize the Onions: In a large skillet, melt the butter over medium heat. Add the sliced onions and sugar, stirring occasionally. Cook for about 15-20 minutes until the onions are golden brown and caramelized.

Create the Sauce: Add the flour to the onions and stir to incorporate. Gradually pour in the vegetable broth and heavy cream, stirring until combined. Allow the mixture to simmer for a few minutes, adding salt and pepper to taste.

Combine: Add the cooked pasta to the skillet, tossing to coat with the sauce. Mix in half of the shredded cheese, allowing it to melt into the pasta.

Serve: Spoon the pasta into bowls, topping each with remaining cheese and garnishing with fresh herbs.