Step 1

Spray a skillet with nonstick spray. Place four slices of bread in pan over medium-low heat.

Step 2

Top each bread slice with 1/4 cup caramelized onions and 1/4 cup cheese. Sprinkle each sandwich with 1/4 tsp fresh thyme.

Step 3

Heat on medium-low until the bread is toasted, onions are heated through, and cheese begins to melt. Top with additional bread slice.

Step 4

Flip each sandwich over and heat until cheese is melted and bread is toasted. Serve immediately.