D.K.
I am guessing your yogurt parfait was a 'bad' choice for several reasons. Theoretically yogurt with fruit and some oats and nuts should be a good choice - but:
Portion size - sounds too big.
Yogurt - most restaurants/cafeterias use yogurt that is loaded with added sugar - even if they start with low fat or non fat yogurt.
Granola - that is oats and nuts (good) covered in sugar and fat (less good) and baked. 1-2 Tbs of granola can add some protein and crunch but usually there is substantially more than that in a parfait and the granola is often way higher in fat and sugar than it needs to be.
Fruit - great (unless of course it is coated in sugar or HFCS).
6-8 oz of low fat/non fat plain yogurt with 1 Tbs homemade granola - great breakfast. 12-16 oz sugar laden yogurt with unknown quantity of commercial granola - less so.