Grease an 8 x 8-inch baking pan Combine flour and soda in a warm bowl
Mix well with a wire whisk set aside
In large bowl use an electric mixer to blend the sugar and butter Add egg and vanilla beat at medium speed until light and smooth Scrape down the sides of the bowl then add the flour mixture pecans and chocolate chips
Blend at low speed until just combined
Do not overmix
Transfer batter into prepared pan and level top with a rubber spatula
Bake in center of oven for 35 to 45 minutes or until toothpick comes out clean but center is still soft