Can I prepare this recipe ahead of time?

Yes, many parts of the recipe can be prepared earlier to save time.

Is this recipe beginner-friendly?

Yes, the steps are simple and suitable for all levels.

Simple substitutions work depending on your preferences or needs.

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Cook pasta according to package instructions until al dente. Drain and set aside.
In a large skillet, melt butter over medium heat. Add sliced onions and cook until caramelized, about 25-30 minutes, stirring occasionally.
Stir in the balsamic vinegar, dried thyme, salt, and pepper.
Add the broth and bring to a simmer, letting it reduce for about 10 minutes.
Combine the cooked pasta with the caramelized onion mixture.
Preheat the oven to 400°F (200°C). Transfer the pasta mixture to a baking dish and sprinkle with Gruyère cheese.
Bake for 15-20 minutes, until the cheese is bubbly and golden.
Garnish with fresh parsley before serving.

Patience is key for caramelizing the onions. Adjust seasoning before baking, and consider making components in advance.