• Cut zucchini in half lengthwise; cut a thin slice from the bottom of each with a sharp knife to allow zucchini to sit flat. Scoop out pulp, leaving 1/4-in. shells.
• Place shells in an ungreased 3-qt. microwave-safe dish. Cover and microwave on high for 3 minutes or until crisp-tender; drain and set aside.
• Meanwhile, in a large skillet, cook beef and onion over medium heat until meat is no longer pink; drain. Remove from the heat; stir in the egg, marinara sauce, bread crumbs, salt, pepper and 1/2 cup cheese.
• Spoon about 1/4 cup into each shell. Microwave, uncovered, on high for 4 minutes. Sprinkle with remaining cheese. Microwave 3-4 minutes longer or until a thermometer inserted into filling reads 160° and zucchini are tender. Serve with additional marinara sauce.
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