Heat 2 tablespoons olive oil in a large skillet or saucepan over medium-high heat.
Season both sides of the 1 pound chicken breasts with 1/4 teaspoon salt, 1/8 teaspoon pepper, and 1/4 teaspoon dried basil.
Sear the chicken in the hot oil about 5 minutes per side, or until the internal temperature reaches 165°F (75°C) and no pink remains; remove to a plate and set aside.
Add the 2 minced garlic cloves to the same pan and cook about 30 seconds until fragrant.
Pour in 2 cups chicken broth and bring to a simmer.
Whisk 1 cup evaporated milk with 2 tablespoons cornstarch until smooth, then stir into the simmering broth.
Stir in 1 teaspoon salt and 1/4 teaspoon ground black pepper.
Add 3 cups dried elbow macaroni, bring back to a gentle simmer, and cook, stirring occasionally, about 10 minutes until the pasta is tender and the liquid is slightly thickened.
Reduce heat to low and stir in 2 cups grated Parmesan and 1 cup grated mozzarella until melted and smooth.
Fold in 1/2 cup halved cherry tomatoes and 1/4 cup fresh basil.
Slice the cooked chicken and return it to the pan, stirring gently to combine and heat through.
Serve warm with an optional drizzle of balsamic glaze.