How to make my graham cracker bites crispy/crunchy? I am attempting to make crunchy graham cracker bites (think granola but made from graham crackers).  I wanted to use the recipe below as a base:

2 1/2 cups graham cracker crumbs
1/3 cup sugar
1/4 cup mashed banana
1/4 cup (1/2 stick) unsalted butter, melted
Preheat oven to 350°F. Stir graham cracker crumbs, sugar, and mashed banana in large bowl to blend. Add unsalted butter and stir to moisten evenly. Press onto bottom and up sides of 10-inch-diameter glass pie dish. Chill until firm, about 30 minutes.
Bake crust until set and pale golden, about 15 minutes. Cool completely.

and then crumble it up.  My problem is that when I used this recipe before the crust came out incredibly hard and almost impossible to eat.
I was contemplating bumping up the heat and cooking it for a shorter amount of time, but this would be total experimentation.
Can anyone suggest any methods for taking the above ingredients and making them into a crispy (but not tough) sheet that can then be crumbled up into granola sized bites?
Two suggestions:


Try making your crumbs larger.
Mix the other ingredients together before adding the crumbs - you want to coat 'em, not soak 'em.