Preheat oven to 350°F. Spray a 9×13-inch baking dish with nonstick cooking spray and set aside.

In a mixing bowl, beat butter, sugar, brown sugar, vanilla, and molasses on medium speed until creamy.

Add the egg and stir until completely incorporated.

Add baking soda, flour, spices, and salt and mix until well combined.

Press dough into the prepared pan.

Bake for 13-15 minutes; do not over-bake.

Cool in a pan on a wire rack.

When bars have cooled, frost with cream cheese frosting and sprinkles.

For the frosting: Cream together the butter and cream cheese.

Add the powdered sugar and vanilla. Slowly mix on low and then beat on high until fluffy.