Here's what I do:
6-8 sheets of graham crackers (regular, cinnamon, or chocolate)
16 oz flavored Greek yogurt, any amount of fat (so many possibilities here! Vanilla, strawberry, honey, or lemon are all great!)
I place them in a Tupperware container that happens to fit two rows of graham crackers perfectly. Start with a base of graham crackers, then layer on some of the yogurt, repeating for 3-4 layers, ending with yogurt. Refrigerate for at least 4 hours before serving. Makes 4 servings.