* Beat butter and sugar at medium speed with and electric mixer until creamy. Add egg, beating well. Stir in squash and vanilla.
* Combine flour and next 3 ingredients; gradually add to squash mixture, beati ng at low speed after each additon. Stir in pecans. Pour batter into a grease d 9-inch square pan, and sprinkle with Streusel Topping.
9 se rvings.
Streusel Topping
1/2 cup firmly packed light brown sugar 1/3 cup all-purpose flour 1/2 teaspoon ground cinnamon 1/4 cup butter, softened 1/2 cup chopped pecans