Grilled Cheese with Caramelized Onions and Spinach

Grilled Cheese with Caramelized Onions and Spinach recipe for #FoodieExtravaganza’s Grilled Cheese event! This grilled cheese sandwich is packed with caramelized onions, greens, and melty Cheddar cheese for a decadent addition to lunch.

Foodie Extravaganza

Foodie Extravaganza is a monthly party hosted by bloggers who love food! Each month we incorporate one main ingredient or theme from The Nibble into recipes to share with you and Lauren of From Gate to Plate chose to celebrate Grilled Cheese for today’s event! Other foods celebrated this month include Coffee Cake, Mushroom, Raisin, Soft Pretzel, Chocolate Mousse, Garlic, Pecan, Cheese Fondue, and Caramel.

Posting day is always the first Wednesday of each month. If you are a blogger and would like to join our group and blog along with us, come join our Facebook page Foodie Extravaganza. We would love to have you! If you’re a spectator looking for delicious tid-bits check out our Foodie Extravaganza Pinterest Board! 

Grilled Cheese with Caramelized Onions and Spinach

I haven’t gotten a chance to participate in FoodieExtravaganza since November (I made Hong Kong French Toast), but I am glad to join this month with Grilled Cheese with Caramelized Onions and Spinach. I had a the ingredients on hand and it was great as a quick lunch.

The caramelized onions can be prepared up to two days in advanced. Once caramelized, transfer to a bowl, cover, and refrigerate until ready to use.

I used Cheddar cheese, but would love to try this again with Gruyere.

If you want to serve all the sandwiches warm at once, keep the cooked ones on a baking sheet in a 200˚F oven as you are cooking the others.

When toasting the grilled cheese, adjust the temperature as needed between low and medium low. You want the bread toasted, but need to give the cheese time to melt before the bread burns.

Check out what everyone else prepared:

• Bacon Apple Mascarpone Grilled Cheese from Sew You Think You Can Cook
• Caramelized Onion Bacon Grilled Cheese from Making Miracles
• Chicken Cordon Bleu Grilled Cheese from Rae Gun Ramblings
• Crusty Griddle Baked Quesadillas with Poblano Rajas from A Day in the Life on the Farm
• Grilled Cheese in the Garden from Culinary Adventures with Camilla
• Grilled Cheese with Caramelized Onions and Spinach from Tara’s Multicultural Table
• Muffuletta Grilled Cheese from Food Lust People Love
• Southern Grilled Cheese from The Freshman Cook
• Spicy Pear Grilled Cheese from Passion Kneaded

Grilled Cheese with Caramelized Onions and Spinach Recipe

Adapted from Simply Reem

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Grilled Cheese with Caramelized Onions and Spinach

Grilled Cheese with Caramelized Onions and Spinach recipe! This grilled cheese sandwich is packed with caramelized onions, greens, and melty Cheddar cheese for a decadent addition to lunch.

Course Main

Cuisine N/A

Keyword caramelized onion, grilled cheese, onion, sandwich, spinach

Prep Time 10 minutes

Cook Time 40 minutes

0 minutes

Total Time 50 minutes

Servings 4 Sandwiches

Ingredients

• 1 1/2 tablespoons vegetable oil
• 2 medium red onions thinly sliced
• Salt and pepper to taste
• 8 slices sourdough or country bread
• 2 tablespoons butter
• 8 ounces Cheddar cheese sliced
• 2 cups baby spinach leaves
• 1/2 teaspoon red pepper flakes if desired
• 1/3 cup mayonnaise

Instructions

• In a large pan, drizzle oil over medium low heat. Once heated, add the sliced onions. Reduce heat to low and cook, stirring occasionally, until a deep purple and caramelized, about 30 minutes. Sprinkle with salt and pepper. Transfer to a medium bowl and allow to cool.
• Place a large skillet over medium low heat.
• Spread butter over one side of each slice of bread. Cover half of the bread slices with a layer of cheese on the buttered side. Cover the cheese with a thin layer of caramelized onions and a few spinach leaves. If desired, season with some red pepper flakes. Top with another layer of cheese, then the remaining bread slices, butter side touching the cheese. Spread the top of each sandwich with mayonnaise.
• Place a sandwich on the heated skillet, mayonnaise coated side down. Spread mayonnaise on the top of the sandwich. Cook until the bottom layer of cheese is melted and bread is golden brown. Flip and cook other side until melted and golden brown.
• Serve immediately and repeat with remaining sandwiches.