Best French Onion Gnocchi Soup Recipe

Ingredients

• 4 tbsp. (1/2 stick) unsalted butter
• 3 large yellow onions (about 2 3/4 lb. total), halved, thinly sliced into half moons
• 2 cloves garlic, finely chopped
• 2 tbsp. all-purpose flour
• 1 tsp. chopped fresh thyme, plus more for serving
• 1 tsp. kosher salt
• 1/4 tsp. freshly ground black pepper
• 1 c. dry white wine
• 6 c. low-sodium beef stock
• 1 lb. gnocchi
• 2 c. grated Gruyère