Preheat oven to 350F.
In a small bowl, combine the flour, brown sugar and the margarine, mix well. Stir in the pecans and the 1/2 cup of Nestle Mini Morsels. Set aside.
In a small bowl, combine the flour, baking powder and baking soda. Set aside. In large bowl, combine margarine, sugar and vanilla extract; mix well. Add the eggs, 1 at a time, beating well after each addition. Gradually add the flour mixture, alternately with the sour cream. Fold in the remaining mini morsels. Spread into a greased 13 x 9 x 2", baking pan. Sprinkle the topping evenly over the batter, Bake in oven at 350F for 45 to 50 minutes. Let cool completely, then cut into squares.
Cajun Country -- New Iberia, Louisiana