Passover Chocolate Walnut Cookies

Step 1
Preheat oven to 350 degrees F (175 degrees C).

Step 2
Grease baking sheets.

Step 3
Melt bittersweet chocolate and margarine together in the top of a double boiler over barely simmering water, stirring frequently and scraping down the sides with a rubber spatula, about 5 minutes. Remove from heat and cool.

Step 4
Combine potato starch and baking powder in a bowl.

Step 5
Beat eggs, sugar, and vanilla extract together in a separate large bowl with an electric mixer on medium speed until light and fluffy, about 5 minutes.

Step 6
Fold the cooled chocolate mixture, potato starch mixture, chocolate chips, and walnuts into egg mixture until just combined.

Step 7
Drop spoonfuls of batter onto the prepared baking sheet.

Step 8
Bake cookies in the preheated oven for 4 minutes, turn baking sheets the opposite way in the oven, and bake until cookies are crisp on the edges, about 6 more minutes.

Step 9
Let cookies cool on sheets for about 5 minutes; transfer to wire racks to finish cooling.