Step 1

In a medium, heavy saucepan, heat the olive oil over medium heat. Add the onions, salt, and pepper. Cook, stirring occasionally, until the onions are tender, about 10-15 minutes. Add the thyme and broth. Simmer, uncovered, until the onions are soft, about 15 minutes.

Step 2

Divide the soup between the 4 ovenproof ramekins. Divide the cubed bread among the ramekins. Top each with slices of fontina cheese. Place under the broiler, until the cheese is golden and bubbly, about 4 minutes. Serve immediately.