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

Active: 30 minTotal: 30 min

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 38 reviews

It looked really good, and while it was satisfying, it was a mess to eat all at once.

By: Taylor
Posted: Jul 05, 2019
Diet: Original

With prep, these are great to make at work for lunch (if you're lucky and have stove access). Very handy, and tasty.

By: Andrea
Posted: Apr 17, 2019
Diet: Original

Can't resist a good grilled cheese!

By: Sundi
Posted: Mar 09, 2019
Diet: Original

It was pretty good, though I wasn't a big fan of having jelly on the sandwich.

By: stephanie
Posted: Feb 27, 2019
Diet: Original


By: Sara
Posted: Feb 25, 2019
Diet: Vegetarian

Liked this but didn't love it, especially compared to some of the other grilled cheese creations from Cooksmarts! Didn't love the Brussels sprouts, wish we had just roasted them.

By: Emily
Posted: Feb 25, 2019
Diet: Original