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Grilled Cheese with Balsamic Red Onions
and balsamic-roasted brussels sprouts

Active: 30 minTotal: 30 min
20190211 balsamic onion grilled cheese nm 2.jpg?ixlib=rails 2.1

We are excited to bring back these unique grilled cheese sandwiches filled with tart and sweet caramelized onions. These were first featured in 2016.



Grilled Cheese with Balsamic Red Onions:
  • Onions, medium red - 1, sliced
  • Oil, cooking - 1 Tbsp
  • Vinegar, balsamic - 1 1/2 Tbsp
  • Brown sugar - 2 tsp
  • Bread, sandwich - 8 slices
  • Butter - 4 Tbsp
  • Jam or jelly - 8 Tbsp (like strawberry)
  • Cheese, fontina - 4 slices (sub provolone or swiss)
Balsamic-Roasted Brussels Sprouts:
  • Brussels sprouts - 1 lb, trimmed and halved
  • Foil - for cooking
  • Oil, cooking - 1 1/2 Tbsp
  • Vinegar, balsamic - 1 1/2 Tbsp
  • Mustard, Dijon - 2 tsp
  • Brown sugar - 1 Tbsp
  • Salt - 1/4 tsp

Nutrition Facts

Serving Size: 1 serving
Servings Per Recipe 4
Amount Per Serving
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% Daily Value
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  1. Onions / Brussels sprouts - (If prepping right before cooking, get oven heating before continuing with prep.) Prep as directed. Larger brussels sprouts should be quartered. Store separately. (Can be done up to 5 days ahead)
  2. Caramelize onions - Heat up a frying pan over medium heat. Add oil (portion for sandwiches) and then add onions to heated oil. Saute for ~10 minutes, until tender but still crunchy. If it looks like the onions or pan will burn at any point, just add a splash of water. Stir in with vinegar and brown sugar (portions for sandwiches). Cook for another 2 minutes. (Can be done up to 5 days ahead)


  1. Heat oven to 500F / 260C.
  2. Spread brussels sprouts out onto a sheet pan. Cover tightly with foil and then bake for ~6 minutes.
  3. Remove foil and toss brussels sprouts with oil, vinegar (portions for brussels sprouts), and mustard. Roast for another 8 to 10 minutes until crispy. Toss with brown sugar (portion for brussels sprouts) and salt, seasoning with more to taste.
  4. While brussels sprouts roast, butter one side of each piece of bread. Lay out bread, buttered-side down. Layer with jam, onions, cheese and top with bread, buttered-side up. Continue until all sandwiches are assembled.
  5. Heat up a griddle or a skillet over medium heat. Place sandwiches onto heated surface (as many as can fit) and press down throughout the grilling process with a spatula. Flip once the first side is golden, ~ 3 to 4 minutes.
  6. Enjoy sandwiches with brussels sprouts on the side.

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This meal has 31 reviews

Very tasty! I was a little skeptical at first, but after seeing a lot of rave reviews, I decided to give it a go. I used strawberry infused balsamic vinegar, so I omitted all the brown sugar from the recipe since the vinegar itself was sweet. Even my picky husband liked it

By: Bianca
Posted: Feb 21, 2019
Diet: Original

Love it. Always a favorite.

By: Chelsea
Posted: Feb 21, 2019
Diet: Original

Yum! Tasty as leftovers too!

By: Elise
Posted: Feb 21, 2019
Diet: Paleo

Excellent! Never would have thought that jam, onions and cheese would be good in a sandwich. Kudos to cooksmart! Need to increase the amount of sauce for the sprouts.

By: Robert
Posted: Feb 20, 2019
Diet: Vegetarian

I really liked this, but next time I will leave out the brown sugar in both the onions and brussel sprouts. It was way too sweet for me, but I liked everything else about it.

By: Jeffrey
Posted: Feb 19, 2019
Diet: Original

This was so good! Chose to go without the jam on the sandwich, went without the brown sugar on the brussel sprouts, and forgot to add the balsamic and brown sugar to the onions. It was still delicious! Definitely recommend if anyone's looking to use a little less sugar!

By: Zoey
Posted: Feb 19, 2019
Diet: Original