Preheat the oven to 375 degrees.

Mix together the beef, egg, onion, garlic powder, salt, pepper.

Press the mixture into a 9x13 inch cake pan to form a shell.

Bake the shell 15 minutes, then pour off any excess fat. (Shell will shrink somewhat during baking...  After baking, I like to transfer shell to a cookie sheet for easy removal after pizza is done.)

On your beef shell, spread pizza sauce.  (Don't get too carried away)

Top with your favorite pizza toppings and cover with a healthy amount of shredded mozzarella. (I like to sprinkle a bit in between layers too)

Bake until cheese is browned and pizza bubbles.  (about 20-25 min.)

Transfer pizza to large cutting board and let cool for 10 minutes. Cut into squares to serve.

This is even great reheated in the microwave the next day.