Baked Blooming Onion

Ingredients

• 1 largeonion
• 60 g (1 cup)panko breadcrumbs
• 125 g (1 cup)flour (wholemeal flour was used)
• 1egg
• 60 ml (¼ cup)milk
• ½ teaspoongarlic powder
• ½ teaspoonpaprika or chilli powder
• ½ teaspoonblack pepper
• ½ teaspoonsalt

Instructions

1. 1

   Preheat the oven

   Heat the oven to 230°C (450°F).

2. 2

   Prepare the coatings

   Whisk the egg with 60 ml (¼ cup) milk in a medium bowl and set aside. In another medium bowl, mix the breadcrumbs with the spices and salt. Put the flour in a third medium bowl.

3. 3

   Cut the onion

   Slice 1.3 cm (½ inch) from the top of the onion and remove the outer layer. Cut the onion into 16 sections, stopping about 1.3 cm (½ inch) from the root so the petals stay attached. Gently spread the petals apart with your fingers; if any cuts have not gone through, press gently to separate them.

4. 4

   Coat the petals

   Carefully dip the onion in flour, then in the egg mixture, then in the breadcrumb mixture. If it needs more coating, dip it carefully in the egg again and sprinkle on extra breadcrumbs.

5. 5

   Bake until golden

   Set the onion on a baking sheet and lightly spray the whole surface with non-stick spray. Cover with foil and bake for 10 minutes, then remove the foil and bake for another 15–20 minutes, until golden brown.

6. 6

   Serve warm

   Serve with ketchup, hot sauce, yoghurt or your favourite dipping sauce.

What is a blooming onion?

A blooming onion is a whole onion cut into attached petals, coated and cooked until the outer layers turn crisp. It is associated with American restaurant appetisers, where it is often deep-fried and served with a dip.

This version uses the oven instead. Panko breadcrumbs give the coating a light, crisp texture, while the root keeps the onion together as it bakes.

Nutrition and macros by portion

The nutrition label shows one serving as written: 220 calories, 8g protein, 47g carbs, 3g fat.

The flour, breadcrumbs and onion provide most of the carbohydrates, while the egg contributes some protein and the milk and egg supply much of the fat. Serve a portion with a protein-rich main and a salad or vegetables to make a more balanced plate.

Choosing the onion

Size matters: a large, firm onion gives you enough room to create distinct petals and makes the finished dish easier to share.

Keep the root intact: cut from the top towards the root, but stop short of it. That uncut base holds the sections together when you spread them open.

Set up the coatings

Flour first: coat the onion before dipping it in egg so the wet mixture has a surface to cling to.

Breadcrumbs last: season the panko with the spices and salt before coating. Work gently so the petals stay open and the crumbs reach between them.

How to coat it evenly

Spread the petals: open them carefully with your fingers before coating, taking care not to break them away from the root.

Add a second layer if needed: the recipe allows another dip in egg followed by extra breadcrumbs where the coating looks sparse. Sprinkle rather than pressing hard, which can close the petals.

Baking and doneness

Covered stage: the first 10 minutes under foil gives the onion time to soften without exposing the coating to full heat straight away.

Uncovered stage: bake for a further 15–20 minutes at 230°C (450°F), checking for a golden coating. If it needs more colour, continue watching closely so the crumbs do not burn.

Serving ideas

Dips: ketchup, hot sauce and yoghurt are suggested options; choose one that suits the seasoning and serve it alongside the onion.

For a meal: serve the onion as a starter or sharing side with a main dish and something fresh, such as a green salad.

Recipe notes & tips

• Use a large, firm onion so the petals are easy to cut and open.
• Keep the root end connected to stop the onion falling apart.
• Set up the flour, egg and breadcrumb bowls before cutting the onion.
• Sprinkle breadcrumbs into the gaps where dipping does not reach.
• Check the onion near the end of the uncovered baking time for colour.
• Serve soon after baking, while the coating is at its crispest.

Variations

• Change the spice: use paprika or chilli powder to adjust the heat.
• Use wholemeal flour: it works in place of plain flour, as in the recipe.
• Add herbs: mix dried herbs into the seasoned breadcrumbs.
• Choose a dip: serve with ketchup, hot sauce or yoghurt.
• Make it dairy-free: use an unsweetened plant-based milk in the egg mixture.

Common mistakes to avoid

• Cutting through the root: leave the root end intact so the petals stay attached.
• Crowding the petals: open them gently before coating so crumbs can reach between them.
• Skipping the flour: coat the onion in flour first to help the egg mixture cling.
• Using too little coating: sprinkle extra breadcrumbs over thinly covered areas after the second egg dip.
• Leaving the foil on: remove it after 10 minutes so the coating can brown.
• Baking without checking: start checking during the final 15–20 minutes to avoid over-browning.

How to store

Cool leftovers, cover and refrigerate for up to 3 days. Reheat in an oven until warmed through; the coating may be less crisp after storage.

Frequently asked questions