Low & Slow Chicken à la King | Mama's Cooking

Ingredients

• 1 cup sweet onion, diced
• 1 rib celery, chopped
• 3 cloves garlic, minced
• 1/4 cup plus 2 tablespoons water, divided
• 3 chicken breasts, boneless and skinless
• 1/2 teaspoon seasoned salt
• 1/2 green bell pepper, diced
• 1 (8-ounce) package mushrooms, sliced
• 1 (10.5-ounce) can condensed cream of chicken soup
• 1 cup chicken broth
• 2 tablespoons cornstarch
• 1 (8-ounce) block cream cheese
• 1 1/2 cups frozen peas
• 1 (17.3-ounce, 2-count) box frozen puff pastry sheets, thawed
• 1 egg
• parsley, to taste, chopped, for garnish