• Preheat the oven broiler.
• Place the slices of bread on a baking sheet, Use 2 tablespoons of olive oil to brush on one side of the slices.. Place them under the broiler for 1-2 minutes until they are golden. Set aside. Turn off the oven.
• Heat 2 tablespoons of the olive oil in a skillet over medium heat. Add the onion slices and cook until they are soft and a deep brown, about 25 to 30 minutes, Transfer to a dish and reserve.
• In the same skillet set over medium heat add the mushroom slices. Cover and cook, stirring occasionally for 8-10 minutes until the mushrooms have released their liquid.

  Remove the lid, add the remaining 2 tablespoons of oil and cook until the mushrooms are a golden brown. Add the garlic, fresh thyme and salt. cook for another 30 seconds until the garlic is soft and fragrant. Transfer to a dish and set aside.

Turn on the oven broiler again:

• With the toasted bread on the baking sheet, add a portion of the cheese to each bread slice, transfer to the oven and allow the cheese to melt slightly. Remove the baking sheet from the oven and assemble the bruschetta.
• Divide the onion and mushrooms over each of the slices of bread, and garnish with fresh herbs. Transfer the bruschetta to a platter and serve warm or at room temperature