Mac and Cheese with Cauliflower

Name: Mac and Cheese with Cauliflower
Ingredients: 4 tablespoons unsalted butter; 3 cloves garlic, finely grated; 1/3 cup panko; Kosher salt and freshly ground pepper; 2 tablespoons chopped fresh parsley; 8 ounces whole-grain elbow macaroni; 1 small head cauliflower, cut into small florets; 3 tablespoons all-purpose flour; 2 cups 2% milk; 2 ounces light cream cheese, at room temperature; 8 ounces white cheddar cheese, shredded (about 2 cups); 1 5-ounce package baby spinach (about 8 cups)