Vegan Cauliflower Alfredo

Name: Vegan Cauliflower Alfredo
Ingredients: 1 head of cauliflower, core removed and cut into medium florets (about 36 ounces total); 1 1/4 cups unsweetened original oat milk; 1 cup plant-based Parmesan, plus more for serving; 4 tablespoons nutritional yeast; 1 teaspoon Dijon mustard; 1 teaspoon onion powder; 1 teaspoon kosher salt; 1/2 teaspoon garlic powder; 1/4 teaspoon ground white pepper; 16 ounces your favorite pasta shape, cooked according to package instructions; Steamed broccoli, for serving