Experience the warmth and richness of classic French onion soup, a dish that combines the sweetness of caramelized onions with the savory depth of beef broth, all topped with a golden, cheesy crouton. Perfect for cozy nights in or impressing your dinner guests.
Heat olive oil in a large pot over medium high heat. Add in onions and saute until tender, about 5 to 7 minutes. Reduce heat to medium low and continue to cook onions until caramelized and golden, about 15 to 25 minutes, stirring every 3 to 5 minutes.
Add in butter and garlic. Let cook until butter melts and garlic is fragrant, about 2 minutes.
Pour in beef broth and sherry (if using). Season with thyme, salt, and black pepper. Add more seasoning to taste. Bring to a simmer and continue to simmer over medium-low heat for 20-30 minutes.
While the soup is simmering, brush each slice of baguette with olive oil on both sides. Place on a baking sheet and toast in the oven underneath the broil setting until golden brown, about 2-3 minutes. Flip and toast the other sides.
Place 4 oven-safe bowls onto a baking sheet. Ladle soup into bowls. Place two slices of toasted baguette on each one. Top with a slice of grueyere cheese and finish with 1/2 tablespoon of parmesan cheese on each bowl.
Slide baking sheet carefully into the oven underneath the broil setting until cheese is bubbling and starting to brown, about 2-3 minutes. Watch closely as broil times may vary. Serve immediately.
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Notes
*If you do not have oven-safe bowls, you can simply put your cheeses onto your toasted French bread slices and melt under the broiler to make little cheesy toasts. When your soup is ready to serve, ladle soup into regular soup bowls and top with your cheesy toasts.