Preheat oven to 300 degrees F. Coat an 8-by-12-inch or 7-by-11-inch baking pan with cooking spray.Advertisement
Stir together coffee powder and vanilla in a large bowl until the powder dissolves. Add sugar, eggs, egg white and salt and beat with an electric mixer on high speed until thick and pale, about 2 minutes. Fold in graham cracker crumbs, dates and pecans. Transfer the batter to the prepared baking pan; smooth the top.
Bake the bars until the top feels dry and a knife inserted in the center comes out clean, 30 to 35 minutes.
Let cool in the pan on a wire rack. Cut into bars. If desired, dust lightly with confectioners' sugar.
Make Ahead Tip: The bars will keep in an airtight container for up to 3 days.
To turn graham crackers into graham crumbs, use a food processor or place the crackers in a large ziplock plastic bag and crush them with a rolling pin.
1 1/2 other carbohydrate, 1 fat