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Italian & Mediterranean
One-Pot French Onion Pasta
A rich, glossy one-pot pasta inspired by classic French onion soup—deeply caramelized onions, savory broth, and melty cheese with minimal cleanup.
RECIPE AT A GLANCE
20
min
Active Time
35
min
Total Time
6
SERVINGS
Stovetop
METHOD
Why It Works
Uses one pot and simple pantry ingredients, with the pasta cooking directly in the sauce so there’s no draining, no extra pans, and very little cleanup—just slow-cooked onions, a short simmer, and a quick cheese finish.
Ingredients
Vegetables
• 4 cups (480 ml) low-sodium vegetable broth
Seasoning
• 2 large yellow onions, thinly sliced
• 3 cloves garlic, minced
• 1 tsp fresh thyme leaves (or ½ tsp dried)
• ½ tsp black pepper
• 2 tbsp olive oil
• 1 tsp dried thyme (or 3–4 sprigs fresh thyme)
Sauce
• ½ cup (120 ml) unsweetened oat milk or whole milk
• 1 cup (240 ml) water
Topping
• ¾ cup shredded Gruyère or low-sodium mozzarella
• ¼ cup finely grated Parmesan
• Optional garnish: extra thyme, chili flakes
Pasta & Grains
• 12 oz rigatoni pasta
How to Make It
1
Heat olive oil in a wide skillet or Dutch oven over medium heat. Add onions and cook 12–15 minutes, stirring often, until deeply golden and caramelized.
2
Add garlic, thyme, and black pepper. Cook 30 seconds until fragrant.
3
Add rigatoni, vegetable broth, water, and oat milk. Stir well.
4
Bring to a simmer, cover, and cook 10–12 minutes, stirring occasionally, until pasta is al dente and sauce is glossy.
5
Reduce heat to low. Stir in Gruyère and Parmesan until melted and stretchy.
6
Taste and adjust seasoning if needed. Serve immediately.
How to Make It
1
Heat olive oil in a wide skillet or Dutch oven over medium heat. Add onions and cook 12–15 minutes, stirring often, until deeply golden and caramelized.
2
Add garlic, thyme, and black pepper. Cook 30 seconds until fragrant.
3
Add rigatoni, vegetable broth, water, and oat milk. Stir well.
4
Bring to a simmer, cover, and cook 10–12 minutes, stirring occasionally, until pasta is al dente and sauce is glossy.
5
Reduce heat to low. Stir in Gruyère and Parmesan until melted and stretchy.
6
Taste and adjust seasoning if needed. Serve immediately.
Ingredients
Vegetables
• 4 cups (480 ml) low-sodium vegetable broth
Seasoning
• 2 large yellow onions, thinly sliced
• 3 cloves garlic, minced
• 1 tsp fresh thyme leaves (or ½ tsp dried)
• ½ tsp black pepper
• 2 tbsp olive oil
• 1 tsp dried thyme (or 3–4 sprigs fresh thyme)
Sauce
• ½ cup (120 ml) unsweetened oat milk or whole milk
• 1 cup (240 ml) water
Topping
• ¾ cup shredded Gruyère or low-sodium mozzarella
• ¼ cup finely grated Parmesan
• Optional garnish: extra thyme, chili flakes
Pasta & Grains
• 12 oz rigatoni pasta
Storage & Reheat
Store:
Store in airtight container up to 3 days.
Reheat:
Reheat gently on the stovetop with a splash of broth or water to loosen the sauce.
Swaps
No rigatoni? Use the same weight of ziti or penne.
Avo's Tip
Caramelize, don’t sauté: Keep the heat at medium and stir often—deep golden onions (not pale or burnt) are the flavor backbone of this dish.
COMMON QUESTIONS
Frequently Asked Questions
Everything you need to know before you start cooking.
Can I make this ahead of time?
Yes. You can cook it fully, cool it, and refrigerate for up to 3 days. Reheat gently with a splash of broth or water to restore the sauce’s creamy texture.
What’s the best cheese substitute if I don’t have Gruyère?
Low-sodium mozzarella works well for melt, or use a mix of mozzarella and Swiss-style cheese for similar flavor without overpowering saltiness.
Why does my sauce look too thick or too loose?
Pasta sauces naturally tighten as they sit. If it’s too thick, stir in warm liquid a tablespoon at a time; if too loose, simmer uncovered for 1–2 minutes to reduce.
Quick Fixes
Pasta sticking: Stir every 2–3 minutes and make sure there's enough liquid — add a splash of broth if the pasta absorbs too fast.
Onions not caramelized: Don't rush this step. 12–15 minutes on medium heat is non-negotiable for deep flavor.
Too salty: Use low-sodium broth and taste before adding any seasoning — the cheese and broth carry a lot of salt already.
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