Baked Spinach and Artichoke Mac and Cheese

Name: Baked Spinach and Artichoke Mac and Cheese
Ingredients: 4 tablespoons unsalted butter, softened and divided; 2 tablespoons all purpose flour; 1 ¼ cups whole milk; 2 ounces cream cheese, softened; 4 ounces shredded white cheddar cheese, plus more for sprinkling on top; 4 ounces hredded fontina cheese, plus more for sprinkling on top; 16 ounces frozen spinach, thawed with excess water squeezed out; 1 (15 ounce) can whole artichoke hearts, drained and quartered; 1 pound cavatappi pasta, cooked al dente and drained