1

Combine flour, baking soda and salt in a small bowl; mix well and set aside.

2

Combine margarine and peanut butter in a mixing bowl; beat on medium speed until blended and smooth. Gradually add both sugars and beat until blended; add egg white and vanilla and beat until smooth. While beating on low speed, gradually add flour mixture and mix until just blended.

3

Transfer dough to a large piece of plastic wrap and roll into an 8-inch log. Wrap log in plastic wrap and freeze for 2 hours. (Note: You can make the cookie dough up to 3 days in advance and freeze until ready to bake.)

4

Preheat oven to 350°F (176°C). Coat a large baking sheet with cooking spray.

5

Remove cookie dough from freezer and slice crosswise into twenty-four 1/4-inch-thick slices; place slices 1 inch apart on prepared baking sheet. Bake until golden around the edges, about 8 to 10 minutes. Transfer to wire racks to cool completely.

6

Yields 1 cookie per serving.