Frosted dream bars

Base:
Combine flour and baking powder. Cut in shortening until mixture is crumbly. Beat egg and milk together. Add to flour mixture. Mix well.
Press firmly into greased 9 inch square cake pan. Spread jam evenly over crust.
Filling:
Beat eggs and brown sugar in small bowl on medium speed of electric mixer until thick and stiff, about 4 minutes. Stir in remaining ingredients. Spread over jam.
Bake at 350 degrees for 35 to 40 minutes, or until set and golden. Cool slightly then frost while still warm.
Icing:
Combine all ingredients using enough cream to make a spreading consistency.
Spread quickly over slightly warm bars.
Find it online:
https://pageturnercookbooks.com/recipe/1944-Frosted-dream-bars