Preheat oven to 350°F. Grease a 9x13 pan or line with foil (leaving overhang on two sides) and grease the foil.

Using a hand mixer or stand mixer, beat butter and SPLENDA® Brown Sugar Blend for about 1 minute, until smooth and creamy. Add molasses, egg, and vanilla and beat until combined, scraping the sides of the bowl as needed.

In a separate bowl, combine flour, spices, baking powder, and salt. Add flour mixture to the wet ingredients, beating until combined.

Spread batter into an even layer in the prepared pan. The batter will be thick. I dampen my fingers with water to help press the batter into an even layer. Bake for about 20 minutes, until the top is dry. The bars might seem slightly underdone but they'll continue to firm up as they cool. Place pan on a wire rack to cool completely.

Using a hand mixer or stand mixer, beat cream cheese and butter until smooth. Add powdered sugar, orange zest and vanilla, beating until combined. Beat in orange juice, 1 teaspoon at a time, until you reach your desired consistency. Pipe or spread the frosting on the cooled bars.