Bring a large pot of water to a boil and preheat oven to 425° F.
Meanwhile in a medium bowl, toss cauliflower with olive oil, salt and pepper and place on a cookie sheet. Roast in the oven until slightly golden brown. Remove from the oven and set aside to cool.
In a large skillet, cook bacon until crispy and remove it from the skillet and set aside.
Cook pasta according to package directions. Drain and save ½ cup of the cooking water.
Add cauliflower and ½ cup of cooking water to the skillet and bring to a simmer. Add pasta and sauté for 1 minute.
Remove from the heat and fold in the cheese and parsley. Top with crispy bacon before serving.
