In a stand mixer bowl, add Splenda, Butter, Eggs, Molasses, Vinegar, Rum, and Vanilla. Mix on medium low speed for 2 minutes.
Slowly add in Flour mixer, mix until well combined. Add in Raisins, mix until well combined.
Pour Raisin mixture over baked Base.
Bake in oven for 35 minutes, (until light golden and crust has formed).
Let cool in pan on rack. Refrigerate 2 hours then cut into squares.