Banana Walnut Bread with Chocolate Chips

1 1/2 cups flour 1 teaspoon baking soda 1 teaspoon baking powder 1/4 teaspoon salt 3/4 cup chocolate chips 3/4 cup chopped walnuts 1/2 cup (1 stick) butter and room temperature 1 cup sugar 2 large eggs 1 cup mashed ripe banana                                                                   2 tablespoons lemon juice                                                                              1 1/2 teaspoon vanilla extract Preheat oven to 350 Line bread pan with wax paper so that it is hanging out of the top or spray with Pam Beat butter in a large bowl until fluffy.  Gradually add sugar beating until well blended.  Beat in eggs 1 at a time.  Beat in mashed bananas, lemon juice and vanilla.  Beat in flour mixture.  Spoon in 1/3 of mixture into pan. Sprinkle with half of the chocolate and walnut chips. Spoon in the rest of the batter and top with remaining chocolate and walnuts.  Bake for about 1 hour 5 minutes or until the fork comes out clean.  Turn onto rack and cool. -Amy