1️⃣ Sauté the Onion
Melt butter in a large pot over medium heat.Add onion and cook until soft and translucent (3–4 minutes).2️⃣ Make the Roux
Whisk in flour and cook for 1 minute, stirring constantly (do not brown).3️⃣ Build the Soup Base
Slowly whisk in chicken broth, milk, and heavy cream until smooth.Simmer gently for 5–7 minutes, stirring often, until thickened.4️⃣ Cook the Broccoli
Add chopped broccoli and cook 8–10 minutes until tender.5️⃣ Add the Cheese
Lower heat. Gradually stir in shredded cheddar until melted and smooth.Season with salt, pepper, paprika, and ground mustard.6️⃣ Serve
Ladle into bowls and serve warm with crusty bread or crackers.