Mix the chicken, tomatoes, flour, chili powder, cumin, garlic powder, salt and pepper in an 8-inch square microwave-safe baking dish until the chicken strips are well coated. Lay the sliced potatoes over the chicken mixture in a single layer, leaving no gaps or holes. Sprinkle the cheese evenly over the potatoes. Cover with a lid or seal with plastic wrap. Microwave on HIGH for 16 minutes or until the potatoes are tender when pierced with a fork and the chicken is cooked through. Let stand for 2 minutes, then use oven mitts or hot pads to transfer the baking dish from the microwave; use tongs to peel back any plastic wrap.