Heat the oven to 350 degrees.
Blend together the flour and sugar for the crust mixture.
Cut in the cold butter until the mixture is crumbly. Reserve 1 cup of this mixture for later.
Press the remaining crust mixture into the bottom of a well greased 9×13 baking dish.
Bake for 15 minutes.
Blend together the filling ingredients, and spread them over the pre-baked crust in the baking dish.
Top with the reserved crust mixture crumbled.
Bake for 1 hour.
Let cook for 15-20 minutes
Beat together the icing ingredients until smooth.
Drizzle the icing over the bars, adding more half and half if needed to thin the icing.
Slice and serve.
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