Line a 9x13-inch baking pan with parchment paper and set aside. Preheat the oven to 375°F.
Use an electric mixer to cream together the butter, cream cheese, granulated sugar, powdered sugar, egg, and almond extract. Start on low speed then increase to medium-high and beat until the mixture is light and fluffy.
3/4 cup butter, 8 ounces cream cheese, 1 cup granulated sugar, 1/2 cup powdered sugar, 1 egg, 1 teaspoon almond extract
Sprinkle the flour, baking powder, and salt over the mixture. Mix again on low speed just until a soft dough forms.
2 and 3/4 cups all-purpose flour, 1/2 teaspoon baking powder, 1/2 teaspoon table salt
Scrape the dough out into the lined baking pan. Using either a spatula or an extra square of parchment paper, gently press the dough into an even layer and into all four corners. The dough is very soft, but take your time and you'll be able to even it out.
Bake for 20-25 minutes. The edges should just be golden, and a knife or toothpick inserted into the middle should come out with just a crumb or two. Set the pan on a wire rack to cool to room temperature.
To make the frosting, use an electric mixer to combine all ingredients. Start on low speed, then increase to medium-high and beat until the frosting is smooth and light.
1/3 cup butter, 4 cups powdered sugar, 2 Tablespoons milk, 1 teaspoon vanilla extract
Spread frosting in an even layer, then add sprinkles as desired.
sprinkles
Use the edges of the parchment paper to lift the entire rectangle of cookie bars out of the pan. Cut into squares and enjoy!