Broccoli Cheddar Soup

Ingredients

• 2 Tbsp unsalted butter
• 1 small yellow onion, diced
• 1 head broccoli, chopped very small (florets only), about 3 cups
• 1 cup shredded carrots
• 32 oz chicken broth (or vegetable broth)
• ½ teaspoon black pepper
• 1 tsp kosher salt
• ¼ tsp crushed red pepper flakes
• ¼ cup cold water
• ¼ cup cornstarch
• 2 cups heavy whipping cream
• 3 cups sharp cheddar cheese, shredded