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Roast beef and cheddar melt sandwich stacked with toasted bread, tender roast beef, caramelized onions, and gooey melted cheddar cheese.

Slow-Cooked Roast Beef & Sharp Cheddar Melt with Caramelized Onions


  • Author: Samantha Brooks
  • Total Time: 8 hours 10 minutes
  • Yield: 2 large sandwiches 1x

Description

The pinnacle of comfort food. This version utilizes a slow-cooked, marinated chuck roast simmered until it practically melts in your mouth. Paired with sharp cheddar and thick-cut rustic bread, this towering melt is crispy, gooey, and heartier than any deli sandwich.


Ingredients

Scale
  • 1 lb thinly sliced chuck roast
  • 1 medium onion (thinly sliced)
  • 1 tsp salt, 1 tsp cracked black pepper, 1 tsp garlic powder
  • 2 slices rustic bread (1-inch thick sourdough or ciabatta)
  • 2 tbsp unsalted butter, 4 slices cheddar cheese
  • Pickles (optional garnish)

Instructions

Marinate: Season chuck roast with salt, pepper, and garlic powder. Refrigerate for at least 4 hours (ideally overnight).

Slow Cook: Place beef and onions in a slow cooker. Cook on Low for 8 hours until tender and falling apart.

Shred: Transfer meat and onions to a bowl, discarding excess juices. Shred into bite-sized pieces with two forks.

Assemble: Butter one side of each bread slice. Layer cheese, a generous pile of beef/onions, and more cheese between the non-buttered sides.

Grill: Cook in a skillet over medium heat for 3–5 mins per side. Press down with a heavy spatula for a ‘panini’ effect until golden brown and melted.

Notes

The Marination Secret: Don’t skip the chill! Salt needs time to break down the proteins in the chuck roast for maximum tenderness.

Crispy vs. Soggy: Shred the beef in a separate bowl rather than in the slow cooker juices to ensure your bread stays crispy rather than oily.

Bread Choice: Use sturdy, thick-cut sourdough or ciabatta; standard sandwich bread will collapse under the weight of the shredded beef.

  • Prep Time: 10 minutes
  • Cook Time: 8 hours
  • Category: Main Course / Sandwich
  • Method: Slow Cooker / Skillet
  • Cuisine: American

Nutrition

  • Serving Size: 1 Sandwich
  • Calories: 625
  • Sugar: 4
  • Sodium: 1150
  • Fat: 38
  • Saturated Fat: 18
  • Unsaturated Fat: 20
  • Trans Fat: 1
  • Carbohydrates: 32
  • Fiber: 2
  • Protein: 42
  • Cholesterol: 135

Keywords: roast beef and cheddar melt, slow cooker roast beef sandwich, shredded beef melt, chuck roast sandwich, gourmet grilled cheese