-
Melt butter in a large stockpot. Add onions and cook for about 5 minutes, until soft.
-
Add the carrots and broccoli, stir with the onions and cook for another 3-4 minutes. Season with salt, pepper, paprika and a couple drops of hot sauce, if using.
-
Pour broth and heavy cream into the stockpot along with the mustard. Whisk until smooth and let simmer over medium to low heat for around 10 minutes.
-
In a small bowl, whisk together the cold broth and cornstarch until smooth. Pour into the stockpot and whisk again until smooth. Simmer for another 5 minutes.
-
Taste and season with additional salt and pepper if desired. Add cheese, stir to mix well and cook just until the cheese is melted.
-
Reduce heat to keep soup warm until you're ready to serve. Pair with bread for dipping and a sandwich or salad on the side!