Use beaters or food processor to mix butter and salt until creamy. Add cheese. Mix well. Gradually add flour, baking powder and water, mixing until dough begins to form a ball. Form dough into a ball with hands.
Roll the dough into 1/8 inch thickness onto a cookie sheet. (I find that placing the dough between two pieces of parchment paper helps me to roll them out more easily.) Cut the rolled out dough into 1 ½ inch squares. Bake 15 minutes at 350° or until lightly browned.
Turn off the oven and leave the crackers inside to crisp up. Store tightly covered.
I used Parmesan cheese. I like these....and they are much better for you than the list of ingredients on the back of a box of crackers. I
think I'll add garlic next time.....I found this recipe at Heavenly Homemaker's.