Chocolate chip biscotti

Ingredients
Butter softened 100 gm or ½ cup
Sugar 1 cup
Eggs 4
Vanilla 1 tsp
Flour 3 cups
Baking powder 1 tbsp
Chocolate chips 1 cup
White chocolate chips ½ cup
Method
In a large bowl, cream butter and sugar until light and fluffy, add eggs one at a time, beating well after each addition, beat in vanilla, combined flour and baking powder, gradually add to creamed mixture and mix well, stir in chocolate chips and white chocolate chips, divide dough into 3 portions on ungreased baking sheet, shape each portion into a 10 inch by 2 inch rectangle, bake on 180 degree C for 20 to 25 minutes until lightly brown, cool for 5 minutes, transfer to a cutting board, cut diagonally with a serrated knife into 1 inch slices, place cut side down on ungreased baking tray, bake for 15 to 20 minutes until golden brown, remove to wire rack, store in an air tight container.