A delightful appetizer featuring caramelized onions and melted Gruyere cheese on crispy crostini.
Preheat your oven to 375°F (190°C).
Ensure the oven is fully preheated for even toasting.
Slice the baguette into thin rounds and arrange them on a baking sheet. Brush each slice lightly with olive oil.
Use a serrated knife for cleaner cuts.
Bake the baguette slices in the oven until golden and crisp, about 8 minutes. Remove and let cool.
Keep an eye on the slices to prevent over-toasting.
Heat olive oil in a skillet over medium heat. Add sliced onions, salt, and pepper. Cook, stirring occasionally, until the onions are soft and golden, about 15 minutes.
Stir frequently to avoid burning the onions.
Add thyme and white wine to the skillet. Cook until the wine has evaporated, about 2 minutes. Remove thyme sprigs.
Deglaze the pan with wine to lift all the flavors.
Preheat the broiler. Top each toasted baguette slice with a spoonful of caramelized onions and a sprinkle of shredded Gruyere.
Distribute the toppings evenly for consistent flavor.
Broil the crostini until the cheese is melted and bubbly, about 2 minutes. Serve warm.
Watch closely to avoid burning the cheese.
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