Savory Baked Onion is a straightforward side dish where whole onions are wrapped in foil and baked with butter, Cajun spices, and Worcestershire sauce until caramelized and tender. The foil-steaming method keeps the onions juicy while allowing the seasonings to infuse deeply.
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Preheat your oven to 375°F (190°C).
Take two peeled white onions and score them on both sides in a criss-cross pattern, being careful not to cut all the way through.
Rub the onions all over with softened butter, making sure to get it into the scored crevices.
Place each onion on a large sheet of aluminum foil.
Season the onions generously with Cajun seasoning, garlic powder, and onion powder.
Drizzle a little Worcestershire sauce over each onion.
Place a pat of butter on top of each seasoned onion.
Wrap each onion tightly in its aluminum foil pouch.
Place the foil-wrapped onions in a cast iron skillet or on a baking sheet and bake for 1 hour and 15 minutes.
Carefully remove from the oven, unwrap, and serve immediately.
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.
aluminum foil · baking sheet
Yes. Assemble the foil packets up to 4 hours ahead, refrigerate, then bake. Add 5–10 minutes to baking time if starting from cold.
Use soy sauce, tamari, or balsamic vinegar (1 tsp each) for similar umami depth and tanginess.
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.
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.
