Add ground beef, grated onion, jalapeño, egg, bread crumbs, cilantro, mint, garam masala powder, salt and pepper and to a large bowl.
1 pound 85% lean ground beef, 1/2 medium grated white onion, 1 chopped jalapeño, 1 egg, 1/4 cup plain dried bread crumbs, 1/2 cup chopped cilantro, 1/4 cup fresh chopped mint, 1 Tablespoon garam masala powder, 1 teaspoon salt, 1/2 teaspoon black pepper