Preheat the oven to 350°F Fahrenheit. Line a 8 x 8 baking pan with parchment paper and set aside. Using a stand mixer fixed with the paddle attachment, beat the butter and sugar together until just combined. Add in the egg, vanilla, and almond extract and beat well.
Scrape down the sides of the bowl and add the salt and flour, beating for about 1 minute. Transfer the cookie dough to your prepared pan, spreading all the way to the edges and smoothing out the top. Don’t worry too much about it being perfectly smooth, because it will soon be covered in frosting! Bake the bars for 20 to 30 minutes. You’ll want to take them out when the edges are golden brown, but the center of the bar is still gooey.
for the frosting
Place the room temperature butter and cream cheese in a stand mixer and beat well. Add the powdered sugar, milk, vanilla extract and salt and beat until light and fluffy, about 3 minutes.
Once the cooke bars are cooled, Using an offset spatula, spread the frosting in an even layer over the cooled cookie bars. Sprinkle with your favorite sprinkles, cut into 16 squares and enjoy!