Broccoli, Cauliflower, and Cheddar Soup with Garlic Croutons

Ingredient:

• Garlic Croutons
• 4 cups (3/4-inch) sourdough cubes
• 3 tablespoons extra-virgin olive oil
• 2 teaspoons finely chopped garlic
• 1/4 teaspoon kosher salt
• 1/4 teaspoon black pepper
• Soup
• 2 (6-ounce) broccoli heads
• 3 tablespoons extra-virgin olive oil
• 3/4 cup chopped yellow onion
• 1 small carrot, peeled and sliced (about 1/4 cup)
• 1 shallot, finely chopped (about 1/4 cup)
• 1 garlic clove, finely chopped
• 1 teaspoon fresh thyme leaves, plus more for garnish
• 6 cups chicken broth, no-chicken broth, or vegetable broth
• 1 1/2 teaspoons cornstarch
• 2 1/2 cups chopped fresh cauliflower florets and stems
• 2/3 cup heavy cream
• 2 teaspoons Dijon mustard
• 8 ounces sharp Cheddar cheese, shredded (about 2 cups)
• Black pepper