Buttery, tart and sweet caramelized onions are the perfect grilled cheese filling. We pair this lovable sandwich with some crispy brussels sprouts that are loaded with favor for a well-rounded meal.
Red onions / Brussels sprouts - If prepping day of, heat up oven in Make Step #1 before returning to prep. Prep as directed. Larger brussels sprouts should be quartered. (Can be done up to 4 days ahead)
Caramelize onions - Heat up a frying pan over medium heat. Add oil 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. Finish with balsamic vinegar and brown sugar. Cook for another 2 minutes. (Can be done up to 4 days ahead)
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Spread brussels sprouts out onto a sheet pan. Cover tightly with foil and then bake for ~6 minutes. Remove foil and toss brussels sprouts with oil, balsamic vinegar and Dijon mustard. Roast for another 8 to 10 minutes until crispy. Toss with brown sugar and salt, seasoning with more to taste.
While brussels sprouts bake / roast, butter one side of each piece of bread with about 1/2 Tbsp (7g) of butter each. Lay out bread buttered-side down. Layer with cheese, jam, onions, cheese and top with bread, buttered-side up. Continue until all sandwiches are made.
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.
Enjoy grilled cheeses warm with brussels sprouts on the side.