Place the baguette slices on a parchment lined baking sheet and spread each slice with butter and a light sprinkling of black pepper (optional).
Toast the bread slices in the preheated oven until lightly golden (5-7 minutes). Remove from the oven and cool. Once cool, rub the toast slices with a clove of garlic and sprinkle lightly with grated Parmesan cheese. Return the toast back into the oven for the cheese to melt (about 2-3 minutes). Remove from the oven and set aside.
To caramelize the onions (this can be done a day or two in advance):
Add the sliced onions to a Dutch oven along with olive oil and butter. Stir well to coat the onions. Cook over medium/high heat (with minimal stirring) for 5-7 minutes.
Add the brown sugar, thyme and rosemary sprigs to the onions and stir to combine. Continue cooking (stirring only occasionally) for an additional 7-10 minutes. You will notice the onions turning a golden color and will have shrunk considerably in volume.
Recued the heat under the pot to medium and add the salt, pepper, and minced garlic. Stir well to combine and cook for an additional 10-12 minutes, stirring only occasionally. Remove the thyme and rosemary stems.
To complete the soup:
Slowly add the beef stock, Worcestershire sauce, brandy, fresh thyme, rosemary, and the bay leaves to the pot with the onions and stir well. Bring the soup to a low simmer and simmer for 5-7 minutes.
Add the dried pasta to the pot, stir well, and cover the pot. Simmer on low for an additional 7 minutes, or until the pasta is cooked through.Remove the herb stems and bay leaves from the soup.
Ladle the soup into oven-safe soup crocks and top each with two slices of garlic cheese toasts and a handful of shredded cheese. Place the crocks into the hot (375-degree F) oven and bake until the cheese is melted and golden. *Note - this is easiest if the crocks are on a baking sheet.
If desired, use a kitchen torch after the crocks come out of the oven to add a bit more color to the melted cheese, and garnish with thyme leaves.
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Notes
The caramelized onions can be made up to two days in advance and stored in an airtight container in the refrigerator.Store any leftovers in an airtight container in the fridge for up to 5 days.This soup may be frozen. Store in an airtight freezer container and freeze for up to 4 months. Thaw overnight in the refrigerator and reheat in a microwave, or in a saucepan on the stovetop.