Method
Preheat the oven to 350°F (175°C). Line a 9 x 13-in. - (23 x 33 cm.) deep pan with parchment. Sift the flour and baking soda together in a bowl. Melt the butter and white chocolate in a heatproof bowl over a saucepan of simmering water, or in the microwave on a low heat.
In a separate bowl, beat the eggs until foamy, then beat in the sugar until well-blended. Stir in the melted chocolate, butter, and vanilla.
Add the dry ingredients and spoon into the pan. Level the surface and sprinkle with the chocolate chips. Place the pan on a baking sheet and bake for 25 to 30 minutes. Remove from the oven, allow to cool in the tray for 10 minutes, then invert onto parchment on a wire tray and cool for 30 minutes. Invert onto chopping board and cut into bars. When completely cool, store in an airtight container for 5 to 7 days.
Makes 2 dozen
Reprinted with permission from ©Quintet Publishing, 500 Cookies: the only cookie compendium you'll ever need, but Philippa Vanstone, published by Sellers Publishing click for book review
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