Easy & Delicious Crockpot French Onion Soup

Ingredients

• 4 large onions, thinly sliced (approximately 1 kg)
• 2 tablespoons unsalted butter (30 g)
• 2 tablespoons olive oil (30 ml)
• 4 cloves garlic, minced
• 1 teaspoon dried thyme (1 g)
• 1 bay leaf
• 6 cups beef broth (1.4 liters) or vegetable broth for a vegetarian option
• 1 cup dry white wine (240 ml) or omit for non-alcoholic version
• Salt, to taste
• Black pepper, to taste
• 1 French baguette or crusty bread
• 2 cups grated Gruyère cheese (200 g) or a mix of Gruyère and Swiss cheese