Combine crumb mixture ingredients and stir until well blended. Press half of mixture into a well-greased 8-by-8-inch baking dish.
In a small saucepan, stir together filling ingredients. Cook and stir over medium heat until bubbly and smooth. Pour filling evenly over crumb mixture. Spread remaining crumb mixture over filling.
Bake for 25 to 30 minutes, until golden brown.
Cut into squares and serve when cool.
Notes
Try adding 1/2 cup chopped walnuts or pecans to the crumb mixture.