Preheat oven to 400°F. Separate cabbage leaves and cut off tough end. In a pot of boiling water, add cabbage leaves one at a time and cook for 2-3 minutes.
In a large bowl, mix together ground beef, egg, onion, garlic, salt, black pepper, chili powder, and brown rice.
Place about 1/4 cup of the beef mixture onto the centre of a cabbage leave. Roll up (like a burrito!), ensuring the ends are tucked in. Repeat with all cabbage leaves and place in a clear 9x11 baking dish.
In a bowl, mix crushed tomatoes, salt, black pepper, chili powder, and dried parsley.
Top cabbage rolls with tomato sauce mixture and cover baking dish with foil. Bake for 45 minutes. Let cool for 10 minutes before serving.
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