Mix toasted squares and pecans in an open roaster. Microwave margarine, brown sugar and syrup. Put it on high for I 1/2minutes a repeat until it boils (you can also boil it on a stove). Next, add baking soda and vanilla extract; mix it well and pour it over the cereal and pecans. Mix it in and bake for approximately I hour at 250 degrees. While it is in the oven, take out and stir a few times After one hour, take it out and spread it on aluminum foil to dry.