Preheat oven to 375 degrees F. Grease baking sheets with vegetable oil.
Sift flour, baking soda and salt on wax paper. Beat butter, sugar and egg in large bowl until fluffy, about 3 minutes. Beat in hot water and vanilla extract. Gradually beat in flour mixture until blended and smooth.
Drop dough by well rounded teaspoonsful on prepared baking sheets. Bake until golden, about 10 minutes. Cool on sheets on wire rack to cool completely.
73 calories, 4 grams fat, 9 grams carbohydrates, 1 grams proteinper serving. This recipe is low in sodium.