Broccoli Cauliflower Alfredo Casserole

6 Servings
1 hr 20 min

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Broccoli cauliflower alfredo casserole is a cheesy holiday side dish that the whole family will love. Roasted broccoli and cauliflower are baked in a cheesy, velvety alfredo sauce that pairs beautifully with roasted meats and is something a bit different on your holiday table.

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wooden board with a round casserole of broccoli cauliflower alfredo casserole with raw broccoli and cauliflower florets on the side with a wooden spoon - top view

It’s three weeks until Thanksgiving. How did time fly by so quickly? I haven’t put the Halloween decorations away yet! Well, when reality hit me in the face, I knew it was time to break out the recipe book and start planning this year’s Thanksgiving dinner.

I want to include dishes that are familiar to my family, but not something that we have often during the year. Vegetable side dishes are their least favorite, so I wanted to add a rich, decadent veggie dish that wows them and is something they actually want to eat.


Why This Recipe Works


  1. Fresh veggies instead of frozen – using fresh vegetables will produce a perfectly tender texture after its cooked. Frozen has a tendency to be a little mushy.
  2. Each item is seasoned – the broccoli, cauliflower, and sauce are all seasoned separately before being combined. This adds layers of flavor that combine together in the casserole for a depth and complexity that is addictive.
  3. Roast the vegetables instead of steaming, microwaving, or boiling them. Roasting broccoli and cauliflower adds a depth of flavor and brings out a sweetness that other methods can’t do.
  4. Homemade alfredo sauce, not the jarred stuff – and using heavy cream and freshly grated Parmesan for the best flavor. Grating the cheese yourself rather than buying it pre-grated will produce the creamiest sauce. Pregrated cheeses have a coating on them to prevent clumping which adds a grittiness to the cheese when melted.
wooden board with a round casserole of broccoli cauliflower alfredo casserole with raw broccoli and cauliflower florets on the side with a wooden spoon - top view
Ingredients Needed


  • Fresh broccoli and cauliflower florets
  • Olive oil
  • Garlic
  • Salt and pepper
  • Nutmeg
  • Butter
  • Heavy cream
  • Italian seasoning
  • Parmesan cheese


Steps To Make This Recipe


  1. Toss the broccoli and cauliflower florets with olive oil, garlic, salt, and pepper.
  2. Roast the vegetables in the oven until tender-crisp.
  3. Make the alfredo sauce by melting the butter and simmering it with the heavy cream.
  4. Whisk in the seasonings and parmesan cheese until the cheese is melted.
  5. Simmer the sauce until thickened.
  6. Toss the vegetables with the alfredo sauce.
  7. Spoon the mixture into a casserole dish and bake until the vegetables are tender and the sauce is bubbly and golden.
wooden board with a round casserole of broccoli cauliflower alfredo casserole with raw broccoli and cauliflower florets on the side with a wooden spoon.
More Holiday Recipes To Try


Instagram - Gray crock with a brocolli and cauliflower allfredo casserole
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Broccoli Cauliflower Alfredo Casserole
Recipe details
  • 6  Servings
  • Prep time: 30 Minutes Cook time: 50 Minutes Total time: 1 hr 20 min
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Ingredients
For the roasted broccoli:
  • 1 head broccoli florets
  • 3 tablespoons olive oil
  • 3 large garlic cloves, finely minced
  • ½ teaspoon salt
  • ¼ teaspoon pepper
For the roasted cauliflower:
  • 1 small head of cauliflower, separated into large florets.
  • 2 tablespoons olive oil
  • 2 large garlic cloves, very finely minced
  • ½ teaspoon salt
  • ¼ teaspoon pepper
For the alfredo sauce:
  • ½ cup butter, room temperature (MUST use butter, not margarine)
  • 1 ½ cups heavy whipping cream
  • 2 teaspoons finely minced garlic
  • ½ teaspoon Italian seasoning
  • ½ teaspoon salt
  • ¼ teaspoon pepper
  • 2 cups freshly grated Parmesan cheese
  • Pinch freshly grated nutmeg
Eats By The Beach (Millie Brinkley)
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