You are going to laugh at how absurdly easy this is (and then you'll wonder why you bother to BUY crackers at all). Here's the basic recipe.
2 Cups flour
1 tsp. baking powder
1/2 tsp. salt
2/3 Cup warm water
1/3 cup vegetable oil
Preheat to 400. Lightly grease two large cookie sheets (I use spray). Combine flour, baking powder and salt (I use a little extra of kosher or sea salt). Stir in water, oil and mix until a smooth dough forms. Halve dough and flatten to edges on each cookie sheet (this is the only part that takes a little time - a small rolling pin would be great but I use my fingers and love the uneven texture of them). Cut them on the sheet before baking (I use a pizza cutter).
If you want you can do an egg wash of one egg white and 2T water brush the tops and sprinkle on sesame seeds.
I have used an unfiltered olive oil instead of vegetable oil. I typically throw in a bunch of chopped rosemary and occasionally a sprinkle of garlic powder or two. You could really do anything you wanted with these: onion powder, cayenne, other herbs and spices.
They are a simple cracker but seriously addictive and always a big hit. Once I topped with goat cheese and honey and served as an appetizer.
Good luck! LEt me know how it goes.