Make topping by combining 1 cup flour with brown sugar, 1/2 cup softened butter
and 1 teaspoon cinnamon in a bowl. Mixture should have the consistency of moist
sand. Add 1/2 cup chopped pecans.
In a large bowl, cream together 1 cup butter, 3/4 cup light brown sugar and 1/2
cup granulated sugar with an electric mixer until smooth and fluffy. Add eggs and
vanilla extract, and mix well.
In a separate bowl combine flour, baking powder and salt. Add this dry mixture
to the moist ingredients a little at a time. Add milk and mix well. Spoon the batter
into a 9 x 13-inch baking pan that has been buttered and dusted with a light coating
of flour. Sprinkle the crumb topping over the batter. Be sure the topping completely
covers the batter.
Bake for 50 minutes or until the edges just begin to brown. Cool.