Creamy Cauliflower Soup

Name: Creamy Cauliflower Soup
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: American
Ingredients: 2 tablespoons salted butter; 1 tablespoon extra virgin olive oil; 1 head cauliflower (cut into small florets); 1 medium white onion (diced); 3 ribs celery (sliced); 3 medium carrots (diced); 4 cloves minced garlic; 1 teaspoon dried thyme; 1 teaspoon dried oregano; 2 tablespoons cornstarch; 2 cups vegetable broth; 2 cups milk; 1/4 teaspoon salt (or to taste); 1/4 teaspoon black pepper (or to taste)