Homestyle Beef Bake

Ingredients

• 4 tablespoons olive oil, divided
• 2 pounds beef sirloin, cut into 1-inch pieces
• 1 teaspoon salt
• 1 teaspoon ground black pepper
• 1 medium onion, chopped
• 2 cloves garlic, minced
• 2 tablespoons tomato paste
• 1 cup dry red wine
• 5 cups plus 1/2 cup beef broth, divided
• 1 pound Yukon gold potatoes, cut into 1-inch pieces
• 1 (8-ounce) package fresh baby portobello mushrooms, quartered
• 1 cup carrots, sliced
• 1 cup celery, sliced
• 6 sprigs fresh thyme
• 2 sprigs fresh rosemary
• 3 bay leaves
• 1 cup frozen peas
• 1 cup frozen corn kernels
• 1/4 cup cold water
• 3 1/2 tablespoons cornstarch
• flour, to taste, for dusting a work surface
• 1 (14.1-ounce) package refrigerated pie crusts