I need 3 times the servings for this recipe?

Garlic and Greens Spaghetti This make 4 servings. I need 3 times this so I need 12 servings for it Ingredients- 16 cloves garlic, thinly sliced 1/3 cup extra-virgin olive oil 2 medium onions, halved and sliced 1/8 teaspoon red pepper flakes, or more to taste Kosher salt 12 cups torn winter greens, such as kale, chard, escarole or mustard greens (about 2 1/2 pounds) 12 ounces spaghetti 1/4 cup grated pecorino romano cheese