Cut off the top and bottom of the zucchinis, then slice them lengthwise. Scoop out the insides and chop them finely. Mince the carrot.

Place the chopped zucchini insides and minced carrot into a microwave-safe bowl. Add the ground meat, ketchup, Worcestershire sauce, salt, and pepper. Mix well, cover loosely with plastic wrap, and microwave at 600W for 3 minutes. Stir and microwave for another 3 minutes.

Line a baking tray with aluminum foil and arrange the zucchini halves. Fill each zucchini evenly with the meat sauce and sprinkle pizza cheese on top. Bake in a toaster oven for 5–10 minutes until the zucchini is cooked and the cheese is melted.