PP has its own small cafe with coffee and muffins, etc..
http://www.dlresortinfo.com/pchgrillcoffeebar.html
Short menu list:
Bagel
$2.19
Cinnamon Roll
$3.19
Assorted Muffins
$2.59
Plain Croissant
$2.59
Assorted "flavored" Croissants
$2.79
Fruit Cup
$3.79
Yogurt
$1.89
White Water Snacks inside GCH is great for picking up and eating on the go..
Here is a menu list:
http://www.themouseforless.com/tripplanning/menus/dl/WhiteWater.shtml
Breakfast
Homemade Buttermilk Biscuit Sandwich, fried eggs, smoked bacon and Cheddar cheese - $4.99
California Breakfast Burrito scrambled eggs, diced tomato, Cheddar cheese, bacon and red bliss potatoes - $4.99
French Toast Sticks with maple syrup and lightly sprinkled with powdered sugar - $3.99
They also have danish, deki case salads/sanwhiches, boxes of cereal, fruit bowls.. etc..
All reasonably priced (compared to in park menus) and APs get 10% discount.
OR
Stop in at La Brea Bakery or Jamba Juice in Downtown Disney
OR
Do a grocery run when you arrive and stock up on breakfast stuff.