Indent your code and post them in php forum bbcode tags. The problem is that:
$query = 'INSERT INTO foods (uid,Chicken Parmesean,Fried Plantains) VALUES
('$_SESSION["uid"]', '$chicken_parmesean', '$fried_plantains')';
is actually:
$query = 'INSERT INTO foods (uid,Chicken Parmesean,Fried Plantains) VALUES('
$_SESSION["uid"]', '$chicken_parmesean', '$fried_plantains')';
Oops, what's the $_SESSION doing there?
In other words, you need to escape the single quotes, or use a double quote delimited string.