Wash potatoes, then pierce three times with a fork. Put in microwave. Cook on HIGH 6 minutes.
Rotate potatoes turn.
Microwave on HIGH 6 minutes. Or bake in 400 F oven for 45-60 minutes. Meanwhile, place chopped tomatoes and ketchup in a medium bowl. Stir topping into tomato and ketchup mixture. Remove potatoes from microwave or oven using a hot mitt or pad.