Our playroom is in the basement but we use the kitchen and bathroom upstairs. Parents come in and out from the main front door and then we go "down to play" once everyone is here.

Make sure you have a plan for what the kids will do upstairs while you make lunch such as coloring, books or puzzles at the table in the kitchen.

Another thing to consider is that you cook the night before and reheat meals downstairs using a microwave, toaster oven, crock pot, etc. You would be surprised how many things you could cook by creating a kitchen area that has just appliances. An electic skillet fries grilled cheese, eggs, etc. Even a two burner hotplate would allow boiling something.

What is making you want to switch to provider made meals if you don't have access to the kitchen which is why I am assuming you had them bring meals in the first place. If parents are sending things for you to heat in a microwave then that is what you would say is that time wise it is better for you to warm one large meal than several small ones. I assume you are providing the non cooked foods like fruit and drinks, snacks etc. If not that would be one place to star with the parent only providing the base lunch meal and you the extras. That won't cost that much so don't expect parents to be willing to pay more than a dollar or two a day for the service. If your rates are already higher than some of the other locations the parents may already be at their maximum meaning the only reason they can afford to be with you is because they provide the meals and dont' see the money outlay situation. To add this amount to the fee all they will see is more money owed not that they were really paying that much already.