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Preheat oven to 425°F. Spray an 8 x 8 x 2-inch baking dish with cooking spray; set aside.
Bring a medium-size pot filled 2/3 with water to a boil. Add the pasta and cook according to package directions; drain. Set aside in a medium bowl.
In a medium saucepan over medium-high heat, add the cauliflower, onion, and garlic. Cover with water. Bring to a boil and then lower the heat to a simmer. Cook the vegetables till they are tender. Drain half of the cooking liquid, reserving a cup or two.
Using a blender, or food processor, puree the vegetables, adding some reserved cooking liquid if the mixture seems too thick. Stir in the cheddar cheese and mustard, and season with salt and pepper.
Pour enough of the cheese and vegetable mixture over the pasta to generously coat. Transfer the pasta to the prepared pan and sprinkle the bread crumbs and parmesan cheese over the top. Bake in the preheated oven for 15-20 minutes or until the bread crumbs are toasted and the cheese is melted. Serve immediately.