Homemade White Castle-Style Hamburgers

Preheat your oven to the desired temperature of 400 degrees Fahrenheit, or equivalently 200 degrees Celsius.

In a large mixing container, merge ground chuck, bread crumbs, egg, onion soup mix, water, and black pepper to create a cohesive mixture. Use your hands or a spoon to press the combined ingredients into a 10x15-inch jelly roll pan, forming an even layer.

Before baking, make strategic holes throughout the ground chuck mixture to allow for airflow during cooking, ensuring that it cooks evenly.

Bake the ground chuck mixture in your preheated oven until it reaches a golden brown color and is fully cooked through, approximately 10 minutes.

Use an instant-read thermometer to verify that the center of the mixture has reached a minimum internal temperature of 160 degrees Fahrenheit, or 70 degrees Celsius. Once done, remove excess grease.

Cut the cooked ground chuck mixture into uniform squares, similar in size to dinner rolls. Place one square of the ground chuck mixture inside each roll.