3. Step
Wipe the pot dry and place over medium-low heat. Add butter and swirl until melted. Sprinkle flour over the butter; whisk until smooth. Slowly add milk, salt and smoked paprika; cook, whisking constantly, until the mixture bubbles and thickens, about 5 minutes. Remove from heat and stir in 1 cup Cheddar and Parmesan. Add the drained pasta and broccoli, stirring to coat well.