Preheat the oven to 350ºF (180ºC). Line an 8-inch square baking pan with parchment paper, leaving a couple of inches of overhang.
In a medium bowl, whisk together the flour, cornstarch and salt.
In a large bowl, beat the butter, sugar and lemon zest until light and fluffy. Beat in the egg until incorporated, then beat in the extracts. Beat in the flour mixture just until combined. Do not over mix.
Spread the batter into the prepared pan. Smooth the top with a spatula. Bake until the top is set and the edges start to turn light golden brown, about 18-20 minutes. Let cool in the pan.
Once cooled, remove the bars from the pan using the parchment paper as handles. Frost and add sprinkles. Cut into squares.
Frosting
In a medium bowl, beat the butter and cream cheese together just until smooth and combined. Add the powdered sugar, lemon juice, cherry extract and salt. Beat until smooth. Mix in the food coloring a little at a time, with the tip of a toothpick, until your desired shade of pink is achieved.
Recipe Notes
*To find the pink gel food coloring I used, click here.