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Creamy Broccoli Cheddar Mac and Cheese (An Easy, Healthy Bake!)

A cozy bowl of homemade, creamy, and cheesy Broccoli Cheddar Mac and Cheese being served for a family dinner.

A comforting and hearty recipe for a Broccoli and Cauliflower Gratin Mac n Cheese. This vegetarian casserole features a simple, creamy sauce made from sour cream and Dijon mustard instead of a traditional béchamel. The sauce is tossed with par-boiled broccoli and cauliflower florets and undercooked whole-wheat pasta. The entire mixture is placed in a baking dish, topped with a generous layer of extra-sharp Cheddar cheese, and baked until deeply golden and bubbly.

Ingredients

  • Kosher salt
  • 1 small head of broccoli, trimmed into florets
  • 1 small head of cauliflower, trimmed into florets
  • 1 pound whole-wheat macaroni or penne
  • 2 cups sour cream
  • 1 tablespoon Dijon mustard
  • 1/3 cup finely chopped chives
  • 2 cloves garlic, grated or crushed into a paste
  • A few drops of hot sauce
  • Freshly ground black pepper
  • 2 1/2 cups grated extra-sharp Cheddar cheese, divided

Instructions

  1. Preheat the oven to 375°F.
  2. Bring a large pot of water to a boil and salt it generously. Add the broccoli and cauliflower florets and boil for 5 minutes. Remove the vegetables with a strainer and set them aside.
  3. Add the pasta to the same boiling water and cook until it is about 2 minutes shy of al dente. Drain the pasta.
  4. While the pasta cooks, combine the sour cream, Dijon mustard, chives, garlic, and hot sauce in a large bowl. Season to taste with salt and pepper.
  5. Add the drained pasta, the cooked broccoli and cauliflower, and about two-thirds of the grated cheese to the sour cream mixture. Stir to combine.
  6. Transfer the mixture to a casserole or baking dish. Sprinkle the remaining cheese evenly over the top.
  7. Place the casserole on a baking sheet and bake for 40 to 45 minutes, until the top is deeply golden and the sauce is bubbly.
  8. Let it rest for a few minutes before serving.

Notes

  • This is a great make-ahead meal; you can assemble the casserole completely, then cool and chill it before baking.
  • The pasta is intentionally undercooked before baking so that it can absorb the sauce in the oven without becoming mushy.
  • Par-boiling the broccoli and cauliflower in the same water used for the pasta is an efficient cooking technique.
  • The sauce is a simple, no-cook mixture with a sour cream base, which is a quick alternative to a traditional cooked béchamel.