Add the steamed cauliflower and vegetable broth to a blender. Cover and pulse until smooth and creamy. Season with garlic powder, salt, and pepper and pulse to mix. Set aside.
Broccoli Mac and Cheese
Fill a large pot 3/4 full with water, add a generous amount of salt, and bring it to a boil. Add the pasta and cook according to the package directions until al dente. During the last 5 minutes of cooking time, add the broccoli florets to the pot with the pasta. Drain and return the pasta and broccoli to the pot.
Turn the heat down to low and return the pot to the stovetop. Add the cauliflower puree, Monterey Jack cheese, and sharp cheddar cheese. Stir occasionally until the cheese has melted.
Check the seasoning and add salt and pepper to taste. Serve warm.
Notes
To steam the Cauliflower:
Stovetop - Place the florets in a steamer basket over an inch of boiling water in a large pot. Cove and steam for 7-9 minutes until fork-tender.
Microwave - Place the florets in a microwave-safe bowl with 2-3 tablespoons of water. Cover the bowl with its lid or an upside-down plate. Microwave on high for 3-5 minutes, cooking longer as needed until fork-tender. Carefully remove the plate (away from your face as steam will come out) and drain any excess water from the bowl.