Combine ketchup, oyster sauce, salt, and pepper in a small bowl and mix well.

Combine beef, pork, panko, egg, onion, and minced garlic in a large bowl. Add the ketchup mixture and mix well.

Cut carrot into quarters along its length, then into pieces the same length as the garlic scapes.

Cover the bottom of a microwave-safe rectangular dish with bacon slices, overlapping as needed. Spread 1/2 of the meat mixture over the bacon. Arrange carrot and garlic scapes on top; spread remaining meat mixture over vegetables.

Cover and microwave meat loaf at 600W for 8 minutes. Let rest, covered, until no longer pink in the center, about 10 minutes more. Slice to serve.