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1/2 cup butter
3 ounces unsweetened chocolate squares
1 cup sugar
1 tsp vanilla extract
1 cup flour
1/2 tsp baking powder
1/8 tsp salt
2 ounces white baking chocolate squares
Preheat oven to 325 degrees F.
Heat butter and unsweetened chocolate in large saucepan over medium-low heat until melted and smooth, stirring frequently so as not to scorch; remove from heat. Whisk in sugar, eggs and vanilla. Sift flour, baking powder and salt together into the chocolate mixture; stir just until blended.
Place white chocolate in resealable plastic bag. Microwave on Medium power for 1-1/2 to 2-1/2 minutes; knead bag until chocolate is just melted; snip one corner from the bag.
Spread half of the batter in a greased & floured 8x8" baking pan; gently squeeze half of the white chocolate in stripes over batter. Repeat with remaining batter and white chocolate.
Bake 25 to 28 minutes until toothpick inserted in center comes out clean.