Grilled Cheese with Onion and Thyme

Drizzle onion slices with olive oil and sprinkle with thyme leaves. Place on a grill pan over medium heat and grill for about 10 minutes until softened and beginning to caramelize.

Meanwhile grate cheese on a box grater. Pile half the grated cheese on one slice of bread, top with some of the grilled onions, and then the remaining cheese and second slice of bread.

Spread softened butter on both sides of the sandwich and return to the grill over medium heat. Initially top with a lid or piece of foil to speed up the melting process. Turn over the sandwich after 2-3 minutes once browned on one side and repeat on the other removing the lid for the last few minutes so the bread can crisp up. Serve immediately.