Savory Baked Onion

Pro tips

• Peel onions completely and trim the root end slightly to help them sit flat and cook evenly in the foil packet.
• Divide the butter between the foil packets and spread it directly on the onion surface before sealing to ensure it infuses as the onion steams.
• Pierce the foil packet carefully when opening—steam will release; use tongs and let it cool for 1 minute before unwrapping to avoid burns.
• For deeper caramelization, unfold the foil in the last 5–10 minutes of baking to allow the onion surface to brown lightly.

Substitutions

• Butter → ghee or olive oil (note: olive oil will add a different flavor profile)
• Cajun seasoning → Creole seasoning or a mix of paprika, cayenne, thyme, and oregano
• Worcestershire sauce → soy sauce, tamari, or balsamic vinegar

Storage & make-ahead

Store cooled baked onions in an airtight container in the refrigerator for up to 3 days; reheat in a 350°F oven for 10 minutes or microwave briefly.

Equipment

aluminum foil · baking sheet

How long does it take to bake onions until tender?

Bake at 400°F for 45–60 minutes, depending on onion size. They're done when a fork pierces the center easily.

Can I make this ahead of time?

Yes. Assemble the foil packets up to 4 hours ahead, refrigerate, then bake. Add 5–10 minutes to baking time if starting from cold.

What can I substitute for Worcestershire sauce?

Use soy sauce, tamari, or balsamic vinegar (1 tsp each) for similar umami depth and tanginess.

Can I use red or yellow onions instead?

Yes. Red onions will be slightly sweeter; yellow onions work the same way as white. Adjust baking time by 5–10 minutes if onions are smaller.

How do I store leftovers?

Refrigerate in an airtight container for up to 3 days. Reheat in a 350°F oven for 10 minutes or microwave for 1–2 minutes.