4 tablespoons unsalted butter
1/2 yellow onion, finely chopped
1 stalk celery, finely chopped
2 small carrots, finely chopped
1 clove garlic, minced
1/2 cup all-purpose flour
2 cups chicken broth
2 cups whole milk
12 ounces beer (not dark)
3 cups grated sharp Cheddar, plus more for garnishing
1 1/2 teaspoons kosher salt
1/4 teaspoon black pepper
1 tablespoon sugar
1 teaspoon hot sauce (optional)
1 baguette
2 tablespoons olive oil