01 -
Heat olive oil and butter in a large oven-safe skillet over medium heat. Add thinly sliced sweet onion and a pinch of salt. Cook slowly, stirring frequently, until onions become deeply golden and caramelized, about 20 to 25 minutes.
02 -
Pour in white wine and scrape any browned bits from the skillet. Simmer for 2 to 3 minutes until most of the liquid has evaporated.
03 -
Stir in beef broth and thyme. Season with freshly ground black pepper and additional salt if needed. Simmer for 5 to 7 minutes to infuse flavors.
04 -
Add gnocchi to the skillet; if using frozen, add directly. Gently stir and cook for 3 to 4 minutes until gnocchi are heated through and begin to absorb some broth.
05 -
While gnocchi simmers, lightly toast French bread slices under a broiler or in a toaster until golden on both sides.
06 -
Arrange toasted bread slices evenly over the gnocchi and broth mixture. Sprinkle shredded Gruyere or Swiss cheese generously over the top.
07 -
Transfer skillet to a preheated oven at 375°F (190°C). Bake for 12 to 15 minutes, or until cheese is melted and bubbling with golden spots.
08 -
Remove from oven and allow to cool slightly before serving. Garnish with extra fresh thyme if desired.