French Onion Soup Casserole

This cozy casserole takes everything you love about classic French onion soup and transforms it into a bubbling, fork-friendly bake that feeds a crowd with minimal fuss. Sweet caramelized onions nestle under a layer of crusty bread soaked in rich beefy broth, all blanketed with gloriously melted Gruyère. It is the kind of dish that makes your whole kitchen smell incredible and has everyone hovering near the oven.

✨ An original recipe written by AI — not kitchen-tested, so trust your taste on seasoning & timing.

Ingredients

• 3 large yellow onions, thinly sliced
• 3 tbsp unsalted butter
• 1 tsp granulated sugar
• 3 cups beef broth
• 2 tbsp dry sherry or white wine
• 1 tsp fresh thyme leaves
• 4 thick slices crusty French bread, cubed
• 2 cups shredded Gruyère cheese
• 1 tbsp olive oil
• salt and black pepper to taste

Directions

1. Preheat your oven to 375°F and lightly grease a 9x13 inch baking dish.
2. Melt butter with olive oil in a large skillet over medium heat, add onions and sugar, and cook stirring occasionally for 35 to 40 minutes until deeply golden and caramelized.
3. Stir in the sherry and thyme, cook 2 minutes, then pour in the beef broth and season generously with salt and pepper.
4. Scatter the bread cubes evenly across the bottom of the prepared baking dish.
5. Pour the hot onion and broth mixture over the bread, pressing the bread down gently so it soaks up the liquid.
6. Sprinkle the shredded Gruyère evenly over the top in a thick layer.
7. Bake uncovered for 20 to 25 minutes until the cheese is melted, bubbly, and golden brown in spots, then let rest 5 minutes before serving.

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