Fettucine with Cauliflower Alfredo Sauce

Name: Fettucine with Cauliflower Alfredo Sauce
Ingredients: 1/4 cup extra-virgin olive oil; 4 small cloves garlic, thinly sliced; 1 small head cauliflower, stemmed and cut into small florets (about 4 cups); 1/4 teaspoon freshly grated nutmeg; Kosher salt and freshly ground black pepper; 2 tablespoons nutritional yeast or Parmesan, plus more for sprinkling; 12 ounces whole-wheat fettucine; Roughly chopped fresh flat-leaf parsley, for serving; Crushed red pepper flakes, for serving, optional