Preheat oven to 375 degrees.
Blend first four ingredients with a mixer until smooth.
Combine salt, baking powder and flour in a separate bowl.
Add slowly to Crisco mixture.
Beat until completely smooth.
Carefully fold in blueberries with a spatula. Pour into 8 x 8 greased pan.
For topping: Combine ½ c. sugar, ⅓ c. flour, ½ t. cinnamon. Cut in ¼ c. soft butter. Sprinkle over blueberry batter. Dot with additional butter if desired.
Bake 40 – 50 min. or until a pick inserted in center comes out clean.
Can be doubled and baked in a 9 x 13.