Butternut Squash Mac And Cheese

Name: Butternut Squash Mac And Cheese
Ingredients: 1 (16-oz.) pkg. uncooked elbow macaroni; 1 medium-size (2 1/2-lb.) butternut squash, peeled, seeded, and cut into 1/2-in. pieces (about 6 cups); 1 Tbsp. olive oil; 2 tsp. kosher salt, divided; 3/4 tsp. black pepper, divided; 1 1/4 cups lower-sodium chicken broth; 1 1/2 cups whole milk; 1/4 cup unsalted butter; 10 oz. extra-sharp Cheddar cheese, shredded (about 2 1/2 cups) and divided; 4 oz. fontina cheese, shredded (about 1 cup) and divided; Cooking spray; Fresh thyme leaves