The meat loaf cooks in the microwave for just 8 minutes, a fraction of the time it takes for traditionally baked meat loaf. Broiling the cheese on top of the cooked meat loaf until it's brown and bubbly lends the dish a pleasing, oven-baked look.
Combine first 8 ingredients (through egg) in a large bowl; stir gently to combine. Spread beef mixture evenly in a 9 1/2-inch microwave-safe loaf dish coated with cooking spray; do not pack beef mixture into dish. Loosely cover with a paper towel. Microwave at HIGH 8 minutes.
Sprinkle meat loaf with cheese; broil 3 minutes or until browned.
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