Caramelized Onion Grilled Cheese (Printer-Friendly)

Crispy, golden-brown bread layered with jammy caramelized onions and melted sharp cheddar for the ultimate comfort sandwich.

# What You'll Need:

→ Bread & Dairy

01 - 4 slices sourdough or country bread
02 - 2 tablespoons unsalted butter, softened
03 - 4 ounces sharp white cheddar cheese, grated

→ Onions

04 - 2 large yellow onions, thinly sliced
05 - 1 tablespoon olive oil
06 - 1/2 teaspoon salt
07 - 1/2 teaspoon sugar, optional for enhanced caramelization

→ Seasonings

08 - Freshly ground black pepper to taste

# How to Prepare:

01 - Heat olive oil in a large skillet over medium heat. Add sliced onions and salt, stirring to coat evenly. Cook, stirring occasionally, for 20-25 minutes until deeply golden and caramelized. Add sugar halfway through cooking if desired to enhance sweetness and browning.
02 - Remove onions from heat and set aside. Wipe skillet clean if necessary. Butter one side of each bread slice. Place two slices buttered side down on a clean work surface.
03 - Top each bread slice with half the grated cheddar cheese, then distribute caramelized onions evenly over the cheese. Season with black pepper to taste. Place remaining bread slices on top with buttered side facing up.
04 - Heat skillet over medium-low heat. Place assembled sandwiches in skillet and cook 3-4 minutes per side, applying gentle pressure with spatula, until bread is crisp and golden and cheese is fully melted. Adjust heat as needed to prevent burning.
05 - Remove sandwiches from skillet and allow to rest for 2 minutes. Slice diagonally and serve immediately while hot.

# Expert Advice:

01 -
  • The onions transform into a sweet, almost candy-like layer that balances the sharpness of the cheddar.
  • It feels fancy enough for a quiet dinner alone but comforting enough to cure a bad day.
  • You only need a handful of ingredients, most of which you probably already have.
  • The buttery, crisp bread gives way to melted cheese and soft onions in every bite.
02 -
  • Don't rush the onions, if you turn up the heat too high, they'll burn on the edges before they soften in the middle.
  • Grate your own cheese instead of using pre-shredded, it melts faster and more evenly without any added starch.
  • Keep the heat medium-low when grilling the sandwich, or the bread will char before the cheese has a chance to melt.
03 -
  • Use a cast iron skillet if you have one, it holds heat evenly and gives the bread a perfect golden crust.
  • If the bread is browning too fast, lower the heat and cover the skillet with a lid for a minute to help the cheese melt.
  • Slice the onions as thin as you can, they'll cook faster and blend into the sandwich more smoothly.
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