In the base of a stand mixer or a large bowl, beat together the 1/2 C. butter for about a minute on a medium speed.

Once nice and smooch, add in the 1/2 C. sweetener and 1/4 C. sugar. Continue to beat until fluffy and light in color.

Beat in the 1 egg, 1 egg yolk, and 2 Tsp. vanilla.

In a medium bowl, whisk together the 1 1/2 C. flour, 1 1/2 Tsp. cornstarch, 1 Tsp. baking soda, and 1/4 Tsp. salt.

Add the dry ingredients into the wet ingredients in three parts, mixing on a low speed in between each addition.

The dough will be quite thick.

Press the cookie dough into the prepared baking dish and back for about 25 minutes or until the top is lightly browned.

Once done, remove from the oven and allow to cool completely.

While the cookie bars are cooling, it’s time to make the frosting!

Beat the 1/4 C. + 2 Tbsp. butter together on a medium speed for about 2 minutes or until creamy.

Add in the 1 C. + 2 Tbsp. confectioners’ sugar substitute, 3 Tbsp. heavy cream, and 1/2 Tsp. vanilla.

Beat the frosting together for about 3 minutes.

Add in food coloring at this time if desired!

Carefully remove the cooled bars from the baking dish and frost them accordingly.

Decorate with sprinkles if desired.

Cut into 9 equal squares and enjoy!

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