Chocolate chunk cookies

Ingredients

• 2 and a half cups flour
• 1 tsp baking soda
• 1 tsp salt
• 1 cup unsalted butter or margarine, at room temperature
• 2/3 cup smooth peanut butter
• 1 cup caster sugar
• 1 cup packed brown sugar
• 2 eggs
• 2 tsp vanilla
• 250g chocolate chunks
• half a cup pecans, coarsely chopped