White chocolate cookies with chocolate chunks

I would like to share with you one of Mrs. Fields mouth watering drop cookie recipes. Debbi Fields is surely the most celebrated cookie-baker of all time. Although her recipes today are loved by the whole world over, they actually began right at her home, in her own kitchen, with her family members as taste-testers. The words "rich" and "delicious" become synonymous with "Mrs. Fields".

YIELD: about 3 dozens

1 cup unsalted butter softened
1 1/2 cups all-purpose flour
1 cup cake flour
1/4 tsp baking soda
1/4 tsp salt
100 g finely chopped white chocolate
1/2 cup granulated sugar
1/2 cup packed light brown sugar
2 large eggs, at room temperature
2 tsp vanilla extract
50 g semi sweet chocolate, cut into chunks

• Preheat oven to 300°F (148°C). Cut 4 tablespoons of the butter into 1/4- inch cubes.
• In a small bowl, combine the flour, baking soda, and salt
• In a double broiler, melt the white chocolate with the butter, stirring until melted and smooth, about 10 minutes. Set aside to cool slightly.
• In a large bowl with an electric mixer, cream the remaining butter with the white sugar and brown sugar. Beat in the eggs one at a time (30 sec interval), beating well after each addition.
• Beat in the melted white chocolate mixture and vanilla. On a low speed, gradually add the flour mixture until just combined. Stir in the semi-seweet chocolate chunks.
• Drop the dough bu rounded teaspoons 2 inches apart onto an ungreased cookie sheet. Bake for about 20 minutes, or until the edges of the cookies begin to brown lightly (the cookies will still be soft lightly in the center). Cool on the cookie sheet for 1 minute, then transfer to wire racks to cool completely.