French Onion Bites

Directions

1. 1
   Preheat oven to 375 F with rack in middle.
2. 2
   Arrange slices on a large baking sheet and bake in oven until golden, about 6-8 minutes. Let cool.
3. 3
   Meanwhile, heat butter and oil in a 10-inch heavy skillet over medium heat until butter is melted, then cook onion, garlic, bay leaf, and thyme with 1/2 teaspoon salt and 1/4 teaspoon pepper, covered, stirring occasionally, 10 minutes.
4. 4
   Uncover skillet and cook, stirring occasionally, until deep golden, about 10 to 15 minutes more. Add wine and cook until entirely evaporated, 1 to 2 minutes. Discard garlic clove, bay leaf, and thyme. Transfer to a small bowl and keep warm, covered.
5. 5
   Preheat broiler.
6. 6
   Arrange toasts on a large baking sheet, then top each with a rounded teaspoon of caramelized onions and sprinkle generously with shredded Gruyere. Broil 3- to 4-inches from heat until cheese is melted, 1 to 2 minutes (watch carefully).
7. 7
   Steps that can be done ahead of time:
8. 8
   Onions can be caramelized 3-5 days ahead and kept chilled.
9. 9
   Bread slices can be toasted and cheese shredded 1-2 days ahead. Keep toasts in an airtight container at room temperature and keep cheese chilled.