It takes a lot of research to provide a balanced homemade diet for a cat. If you want to do that more power to you. But I prefer to supplement my cats diets with fresh food treats. You could give your cats as a treat:
cooked meat, poultry, or fish
a teaspoon of yogurt or cottage cheese
scrambled egg or cooked egg yolk
filet mignon served rare or cooked whatever your cat prefers
A small amount of cooked veggies or oat meal
Lactose free milk or a special cat milk
Just think healthy, unseasoned, unspiced food. No onions, garlic, chocolate(these foods are toxic to cats), You know. common sense.