Double Cheese & Caramelized Onion Sheetpan Sandwiches

These make-ahead sheetpan sandwiches are a fast and easy way to feed a crowd. Set them aside and pop them in the oven whenever you’re ready to get the party started. Level them up with a dense Belgian or artisan loaf for a wonderful crust and crunch or try with a rye or sourdough bread for great flavour.

Recipe Details

Prep Time: 20min

Cook Time: 35min

Serves: 4


  • 2 tbsp (30 mL) butter
  • 1 large onion, thinly sliced
  • 1/2 tsp (2 mL) dried thyme leaves
  • 1/4 tsp (1 mL) salt
  • 8 slices bakery bread (about 1/2 inch/1 cm) thick
  • 3 tbsp (45 mL) butter, softened
  • 3 tbsp (45 mL) basil or sundried tomato pesto
  • 1 brie round, sliced (175 g)
  • 1 cup (250 mL) shredded Appenzeller style cheese, such as Wildwood by Stonetown Artisan Cheese

Preparation Method

Step One:

In a large skillet over medium heat, melt butter. Add onion, thyme and salt; cook, stirring often for about 20 minutes or until onion is very soft and golden brown. Set aside.,

Step Two:

Preheat oven to 450 F (232 C). Line a baking sheet with parchment paper; set aside.

Step Three:

Spread butter on 1 side of each slice of bread. Press some of the Appenzeller cheese to 4 of the buttered sides and place cheese side down on prepared pan. Spread pesto on those 4 slices of bread. Top with onions and brie cheese. Top each with remaining bread slices, butter side up. Sprinkle with remaining Appenzeller and press sandwiches down slightly.

Step Four:

Bake for 8 minutes and remove from oven. Using a flat spatula, flip sandwiches carefully and press down again slightly. Return to oven for about 5 minutes or until golden brown and cheese is melted. Let cool slightly before serving.

Mix it Up!

Quesadilla Variation: Substitute 8 flour tortillas (7 inch/17.5 cm diameter) for sliced bread and reduce cooking time to 3 minutes per side or until golden.

Nutritional Info per serving (1 sandwich):
670 calories, 43 g fat, 22 g saturated fat, 1.0 g trans fat, 105 mg cholesterol, 1100 mg sodium, 48 g carbohydrates, 3 g fibre, 8 g sugars, 22 g protein.

Top 5 Nutrients:
Calcium 33%DV, Vitamin B12 31%DV, Vitamin A 23%DV, Riboflavin 20%DV, Niacin 18%DV.


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Double Cheese & Caramelized Onion Sheetpan Sandwiches

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