Spicy Cajun Chicken Pot Pie

Name: Spicy Cajun Chicken Pot Pie
Ingredients: One 9-inch round refrigerated pie dough; 1 1/2 cups whole milk, plus more, for brushing; 1 teaspoon chopped fresh thyme; 1 teaspoon Cajun seasoning; 3 tablespoons unsalted butter; 1 small green bell pepper, diced; 1/2 medium onion, chopped; 3 tablespoons all-purpose flour; 8 ounces small red potatoes, diced; 3 cups coarsely shredded cooked chicken (from a rotisserie chicken); 1 tablespoon chopped pickled jalapenos; Kosher salt and freshly ground black pepper