Lemon Thyme Roasted Chicken over Pasta

Name: Lemon Thyme Roasted Chicken over Pasta
Ingredients: 2 tablespoons fresh thyme leaves; 1 tablespoon lemon zest; 1 tablespoon kosher salt; ½ teaspoon ground pepper; 6 skinless, boneless chicken breast halves; 2 tablespoons olive oil; 2 tablespoons butter; 2 large garlic cloves, minced; 2 cups chicken stock; 1 tablespoon corn starch; ½ cup unsweetened apple sauce,; 2 chicken flavored bouillon cubes; 1 tablespoon fresh squeezed lemon juice; 1 pound spaghetti pasta cooked al dente and according to the package directions.; Fresh thyme sprigs as garnish