Easy Baked Indian Samosas

Name: Easy Baked Indian Samosas
Ingredients: 4 potatoes, peeled and cubed; 0.25 cup oil; 2 small onions, finely chopped; 3 tablespoons coriander seed; 1 tablespoon curry powder; 1 (1 inch) piece fresh ginger, grated; 1 teaspoon salt; 1 teaspoon ground turmeric; 1 teaspoon ground cumin; 0.5 teaspoon ground allspice; 0.5 teaspoon cayenne pepper; 0.125 teaspoon ground cinnamon; 2 roma (plum) tomatoes, finely chopped; 0.5 cup frozen peas; 4 prepared pie crusts; 2 egg whites, beaten, or as needed