Leftover Turkey Pot Pie Empanadas

Name: Leftover Turkey Pot Pie Empanadas
Ingredients: 1 teaspoon unsalted butter; 1/4 cup chopped onion; 1/4 cup chopped celery; 2 tablespoons chopped fresh parsley; 1 clove garlic (minced); 1 tablespoon corn starch; 1/2 cup low sodium chicken or turkey broth; 1 1/4 cups leftover shredded cooked turkey breast (5 ounces); 3/4 cup frozen peas and carrots; 3/4 teaspoon kosher salt; 1/8 tsp ground black pepper; 1/2 tsp dried thyme; 10 frozen Goya Empanada Discos (the ones for baking, thawed); cooking spray; 1 large egg (whisked)