Double Cheese & Caramelized Onion Sheet Pan Sandwiches - Milk

Ingredients

• 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