Instructions:
- Caramelize the Onions:
- Heat the butter and olive oil in a large skillet over medium heat.
- Add the thinly sliced onions to the skillet and sauté until they begin to soften, about 5 minutes.
- Reduce the heat to low and continue to cook the onions, stirring occasionally, until they turn golden brown and caramelized, about 20-25 minutes.
- Sprinkle the brown sugar over the onions and continue cooking for an additional 5 minutes, stirring occasionally.
- Season the onions with salt, black pepper, and dried thyme (if using), then remove them from the heat and set aside.
- Prepare the Toast:
- Preheat your oven broiler on high.
- Place the slices of bread on a baking sheet and toast them under the broiler for 1-2 minutes on each side, or until they are lightly golden brown.
- Assemble the Cheese and Onion on Toast:
- Spread a generous layer of caramelized onions onto each slice of toasted bread.
- Sprinkle the shredded cheese evenly over the caramelized onions, covering them completely.
- Broil the Toast:
- Place the assembled toast back under the broiler for 2-3 minutes, or until the cheese is melted and bubbly, and the edges of the bread are crispy and golden brown.
- Serve and Garnish:
- Carefully remove the cheese and onion on toast from the oven and transfer them to serving plates.
- Garnish with fresh parsley or chives, if desired, for a pop of color and added freshness.
- Serve the toast hot, as is, or alongside a fresh salad or soup for a complete meal.