It is not recommended to feed matcha or any other caffeine-containing products to cats. Cats are more sensitive to caffeine than humans, and even a small amount of caffeine can be harmful to them. Caffeine can cause restlessness, hyperactivity, increased heart rate, tremors, and other health problems in cats, which can be life-threatening in severe cases. Therefore, it's best to avoid feeding matcha or any other caffeinated products to cats and stick to a balanced and nutritionally complete cat food recommended by a veterinarian. If you suspect that your cat has consumed matcha or any other caffeine-containing products, it's best to consult with a veterinarian immediately.