Ghana Meat Pie

Ingredients

• 4 cups all-purpose flour
• 1 teaspoon baking powder
• 1 1/3 cup unsalted butter, cubed
• 2/3 cup cold water
• 1/2 teaspoon salt
• 1 1/2 pounds ground beef
• 1 onion, diced
• 1 teaspoon onion powder
• 1 teaspoon garlic powder
• 1 teaspoon ground black pepper
• 1 teaspoon curry powder
• 1 teaspoon Cameroon pepper (sub cayenne pepper)
• 1 1/2 teaspoon salt, or to taste
• 1 cup broth (beef, chicken or vegetable)
• 1 tablespoon cornstarch
• 1 egg
• 1 tablespoon water